Developer guide and easy setup

[Shivamdhar]

Signed-off-by: Shivam Dhar dhshivam@amazon.com

Description

Adds developer guide and changes the repo to work from within OSD.

Aim of the PR is:

• to run all the yarn commands from within OSD by adding the plugin
• to raise PRs from the plugin folder within OSD

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #12 (76ea399) into main (31dc140) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files           4        4           
  Lines         123      123           
  Branches       19       19           
=======================================
  Hits          111      111           
  Misses          8        8           
  Partials        4        4           

Impacted Files	Coverage Δ
...rt_map/public/components/vector_upload_options.tsx	90.47% <ø> (ø)
src/plugins/custom_import_map/public/services.ts	80.00% <ø> (ø)

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