docs: update README.md to clarify usage

[emilyJLin95]

Just clarifying how to run Ganache for usage on the CLI as well as in programmatic usage.

[davidmurdoch]

The section you're updating is about adding ganache to an npm project (it gets added to their package.json as a dependency).

There is already a section in the README.md about command line use that says:

Once installed globally, you can start ganache right from your command line:

$ ganache
Ganache CLI v6.12.1 (ganache-core: 2.13.1)

I welcome improvements to the readability here so it is more clear on the different ways ganache can be used.

[emilyJLin95]

ah okay updated section titles

also, just wondering, is line 50 still up to date? do we support node v12

@davidmurdoch

[davidmurdoch]

ah okay updated section titles

also, just wondering, is line 50 still up to date? do we support node v12

@davidmurdoch

Yes, Ganache still works with v12.0.0+. This will be changing soon though.

[eggplantzzz]

I like

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