[added] build workflow

[thekaushikls]

1. Added a Github Action to automatically build and release plugin when Version number is changed in .csproj file.
2. Added PostBuild script to load plugin when building locally.
3. Added launchSettings.json to run _-Grasshopper command when builiding locally.

[lin-ycv]

instead of running this on all push and schedule, it's probably better to run only when a new release is specified:

on:
  release:
    types: [published]

this would also allow for changes to the version number during dev without accidentally creating a release.
this would also minimize action and minute usages

[thekaushikls]

@lin-ycv thanks for the suggestion. I was assuming the main branch will be protected, and contributors will only raise pull request. Which means, only admins can trigger this workflow.

Also, since the version information is taken from the .csproj file, it would be easier to just update the version number directly from VisualStudio.

If you suggest that it is comfortable to update in all places (Brain.csproj and the GitHub release tag), it can be done. In that case, do you think having a workflow_dispatch is better? (Example Below)

Reference: basecamp