[DO NOT MERGE] feat(docs): add April milestone

docs/site/_april_milestone.md

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+# April Milestone
+
+## Overview
+
+With COVID-19 impacting the maintainers (like everyone else in the world!) at
+different levels, we will be committing less story points to give us more
+flexibility.
+
+The goals for this month would be to:
+
+- Aim at finish the
+  [Migration guide epic](https://github.com/strongloop/loopback-next/issues/3935)
+  excpet for the
+  [migrate LB3 components related tasks](https://github.com/strongloop/loopback-next/issues/3955).
+- Finish
+  [From model definition to REST API with no custom repository/controller classes epic](https://github.com/strongloop/loopback-next/issues/3935)
+
+## Goals
+
+- [ ] Migration guide #3935
+
+  - [ ] Migration Guide: Boot up #4838
+  - [ ] Migration Guide: Custom validation #4837
+  - [ ] Spike: How to migrate LB3 components #4099
+  - [ ] How to map LB3 CLI commands to LB4 CLI #3953
+  - [ ] Spike: How to migrate apps using loopback-component-oauth2 #3959
+  - [ ] How to run LB3 app tests when the app is mounted in a LB4 project #3978
+
+- [ ] From model definition to REST API #3935
+
+  - [ ] Docs for exposing REST API of a Model with no custom classes #2740
+
+- [ ] APIC/LB integration
+
+  - [ ] [Spike] End to End test Shopping example in cloud with APIConnect #4498
+
+- [ ] Documentation
+
+  - [ ] Docs: Add "Working with Data" section #2527
+  - [ ] Docs: how to use OpenAPI connector #4488
+
+- PR reviews
+  - [ ] feat(repository): hasManyThrough #4438
+
+## Stretch Goals
+
+- [ ] LB4 adoption
+
+  - [ ] Blog on what LB can offer on top of Express #4852
+
+- [ ] APIC/LB integration
+
+  - [ ] [Blog] Managing your APIs: From LoopBack to IBM API Connect #4901
+
+- [ ] Miscellaneous
+  - [ ] Extract the jwt authentication to an extension module #4903
+  - [ ] Custom visual style of REST API Explorer #2023
+  - [ ] Spike: robust handling of ObjectID type for MongoDB #3456
+
+## Looking for Community Contributions
+
+- OpenAPI related
+
+  - [ ] Complex OpenAPI Validations with @property #1624
+  - [ ] :running: Add bearer auth scheme as the default security scheme #4386
+  - [ ] OpenAPI schema generation and model inheritance #3293
+
+- Miscellaneous
+  - [ ] default values added for new required columns when running
+        `autoupdate()`
+        https://github.com/strongloop/loopback-connector-postgresql/pull/418
+  - [ ] Model.toObject() should preserve prototypes (e.g. Date and ObjectID
+        values) #3607
+  - [ ] :running: [Spike] How to migrate Angular 1.x and 2+ LB3 client #4610
+  - [ ] :running: Document how to send emails in LB4 #1979