docs(readme): add examples section and todomvc

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [sinon](https://sinonjs.org/) ([source](https://togithub.com/sinonjs/sinon)) | [`^12.0.0` -> `^13.0.0`](https://renovatebot.com/diffs/npm/sinon/12.0.1/13.0.0) | [![age](https://badges.renovateapi.com/packages/npm/sinon/13.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/sinon/13.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/sinon/13.0.0/compatibility-slim/12.0.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/sinon/13.0.0/confidence-slim/12.0.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>sinonjs/sinon</summary>

### [`v13.0.0`](https://togithub.com/sinonjs/sinon/blob/HEAD/CHANGES.md#&#8203;1300)

[Compare Source](https://togithub.com/sinonjs/sinon/compare/v12.0.1...v13.0.0)

-   [`cf3d6c0c`](https://togithub.com/sinonjs/sinon/commit/cf3d6c0cd9689c0ee673b3daa8bf9abd70304392)
    Upgrade packages ([#&#8203;2431](https://togithub.com/sinonjs/sinon/issues/2431)) (Carl-Erik Kopseng)
    > -   Update all @&#8203;sinonjs/ packages
    >
    > -   Upgrade to fake-timers 9
    >
    > -   chore: ensure always using latest LTS release
-   [`41710467`](https://togithub.com/sinonjs/sinon/commit/417104670d575e96a1b645ea40ce763afa76fb1b)
    Adjust deploy scripts to archive old releases in a separate branch, move existing releases out of master ([#&#8203;2426](https://togithub.com/sinonjs/sinon/issues/2426)) (Joel Bradshaw)
    > Co-authored-by: Carl-Erik Kopseng <[email protected]>
-   [`c80a7266`](https://togithub.com/sinonjs/sinon/commit/c80a72660e89d88b08275eff1028ecb9e26fd8e9)
    Bump node-fetch from 2.6.1 to 2.6.7 ([#&#8203;2430](https://togithub.com/sinonjs/sinon/issues/2430)) (dependabot\[bot])
    > Co-authored-by: dependabot\[bot] <49699333+dependabot\[bot][@&#8203;users](https://togithub.com/users).noreply.github.com>
-   [`a00f14a9`](https://togithub.com/sinonjs/sinon/commit/a00f14a97dbe8c65afa89674e16ad73fc7d2fdc0)
    Add explicit export for `./*` ([#&#8203;2413](https://togithub.com/sinonjs/sinon/issues/2413)) (なつき)
-   [`b82ca7ad`](https://togithub.com/sinonjs/sinon/commit/b82ca7ad9b1add59007771f65a18ee34415de8ca)
    Bump cached-path-relative from 1.0.2 to 1.1.0 ([#&#8203;2428](https://togithub.com/sinonjs/sinon/issues/2428)) (dependabot\[bot])
-   [`a9ea1427`](https://togithub.com/sinonjs/sinon/commit/a9ea142716c094ef3c432ecc4089f8207b8dd8b6)
    Add documentation for assert.calledOnceWithMatch ([#&#8203;2424](https://togithub.com/sinonjs/sinon/issues/2424)) (Mathias Schreck)
-   [`1d5ab86b`](https://togithub.com/sinonjs/sinon/commit/1d5ab86ba60e50dd69593ffed2bffd4b8faa0d38)
    Be more general in stripping off stack frames to fix Firefox tests ([#&#8203;2425](https://togithub.com/sinonjs/sinon/issues/2425)) (Joel Bradshaw)
-   [`56b06129`](https://togithub.com/sinonjs/sinon/commit/56b06129e223eae690265c37b1113067e2b31bdc)
    Check call count type ([#&#8203;2410](https://togithub.com/sinonjs/sinon/issues/2410)) (Joel Bradshaw)
-   [`7863e2df`](https://togithub.com/sinonjs/sinon/commit/7863e2dfdbda79e0a32e42af09e6539fc2f2b80f)
    Fix [#&#8203;2414](https://togithub.com/sinonjs/sinon/issues/2414): make Sinon available on homepage (Carl-Erik Kopseng)
-   [`fabaabdd`](https://togithub.com/sinonjs/sinon/commit/fabaabdda82f39a7f5b75b55bd56cf77b1cd4a8f)
    Bump nokogiri from 1.11.4 to 1.13.1 ([#&#8203;2423](https://togithub.com/sinonjs/sinon/issues/2423)) (dependabot\[bot])
-   [`dbc0fbd2`](https://togithub.com/sinonjs/sinon/commit/dbc0fbd263c8419fa47f9c3b20cf47890a242d21)
    Bump shelljs from 0.8.4 to 0.8.5 ([#&#8203;2422](https://togithub.com/sinonjs/sinon/issues/2422)) (dependabot\[bot])
-   [`fb8b3d72`](https://togithub.com/sinonjs/sinon/commit/fb8b3d72a85dc8fb0547f859baf3f03a22a039f7)
    Run Prettier (Carl-Erik Kopseng)
-   [`12a45939`](https://togithub.com/sinonjs/sinon/commit/12a45939e9b047b6d3663fe55f2eb383ec63c4e1)
    Fix 2377: Throw error when trying to stub non-configurable or non-writable properties ([#&#8203;2417](https://togithub.com/sinonjs/sinon/issues/2417)) (Stuart Dotson)
    > Fixes issue [#&#8203;2377](https://togithub.com/sinonjs/sinon/issues/2377) by throwing an error when trying to stub non-configurable or non-writable properties

*Released by [Carl-Erik Kopseng](https://togithub.com/fatso83) on 2022-01-28.*

</details>

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [null-loader](https://togithub.com/webpack-contrib/null-loader) | devDependencies | major | [`^3.0.0` -> `^4.0.0`](https://renovatebot.com/diffs/npm/null-loader/3.0.0/4.0.0) |

---

### Release Notes

<details>
<summary>webpack-contrib/null-loader</summary>

### [`v4.0.0`](https://togithub.com/webpack-contrib/null-loader/blob/master/CHANGELOG.md#&#8203;400-httpsgithubcomwebpack-contribnull-loadercomparev300v400-2020-04-15)

[Compare Source](https://togithub.com/webpack-contrib/null-loader/compare/v3.0.0...v4.0.0)

##### Bug Fixes

-   support `webpack@5`

##### ⚠ BREAKING CHANGES

-   minimum required Nodejs version is `10.13`

</details>

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This PR was generated using Autosynth. 🌈

Synth log will be available here:
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- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@89d431f

fix: use google-gax v3.3.0
Source-Link: googleapis/synthtool@c73d112
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:b15a6f06cc06dcffa11e1bebdf1a74b6775a134aac24a0f86f51ddf728eb373e

Source-Link: googleapis/synthtool@d229a12
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:74ab2b3c71ef27e6d8b69b1d0a0c9d31447777b79ac3cd4be82c265b45f37e5e

🤖 I have created a release \*beep\* \*boop\*
---
### [3.0.1](https://www.github.com/googleapis/nodejs-document-ai/compare/v3.0.0...v3.0.1) (2021-07-21)


### Bug Fixes

* **deps:** google-gax v2.17.1 ([#243](https://www.github.com/googleapis/nodejs-document-ai/issues/243)) ([a9e4efd](https://www.github.com/googleapis/nodejs-document-ai/commit/a9e4efd2478def845376a951c40b76e3384a8b29))
* Updating WORKSPACE files to use the newest version of the Typescript generator. ([#245](https://www.github.com/googleapis/nodejs-document-ai/issues/245)) ([06bf319](https://www.github.com/googleapis/nodejs-document-ai/commit/06bf3190cad3c9ce98e13aff718bb11db85dd4e5))
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* feat: Policy Tag Manager v1 API service feat: new RenameTagTemplateFieldEnumValue API feat: adding fully_qualified_name in lookup and search feat: added DATAPROC_METASTORE integrated system along with new entry types: DATABASE and SERVICE docs: Documentation improvements

PiperOrigin-RevId: 365620142

Source-Author: Google APIs <[email protected]>
Source-Date: Mon Mar 29 11:20:23 2021 -0700
Source-Repo: googleapis/googleapis
Source-Sha: a1ab4d44db02d59ff58810c6d4182d84e4b9abaa
Source-Link: googleapis/googleapis@a1ab4d4

* docs: reformat comments in PolicyTagManager definition

PiperOrigin-RevId: 368687296

Source-Author: Google APIs <[email protected]>
Source-Date: Thu Apr 15 11:56:51 2021 -0700
Source-Repo: googleapis/googleapis
Source-Sha: 91eee3d039fbdbadee008393504900287bbc6f43
Source-Link: googleapis/googleapis@91eee3d

🤖 I have created a release \*beep\* \*boop\*
---
## [2.3.0](https://www.github.com/googleapis/nodejs-datacatalog/compare/v2.2.0...v2.3.0) (2021-04-27)


### Features

* new RenameTagTemplateFieldEnumValue API ([#244](https://www.github.com/googleapis/nodejs-datacatalog/issues/244)) ([1efaf9b](https://www.github.com/googleapis/nodejs-datacatalog/commit/1efaf9be12b84135643761cf01372726ec7dd249))
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