Add: Litmus Enhancement Proposals directory

[namkyu1999]

Proposed changes

I would like to suggest introducing Litmus Enhancement proposals. As our community continues to grow, we can come up with a lot of ideas. I have previously written a proposal for a backstage plugin using Google Docs, but now I propose posting proposals on GitHub. This approach has several advantages over using Google Docs.

• In the case of Google Docs, the author retains ownership since it is a platform separate from GitHub. So, if the document is deleted, it cannot be archived.
• Proposals are submitted through pull requests, allowing for feedback.
• Since we store our documents in a GitHub directory, we don't need to create a GitHub wiki to archive them.

People who want to propose new features for Litmus can use the template to submit a new proposal.

Types of changes

What types of changes does your code introduce to Litmus? Put an x in the boxes that apply

• New feature (non-breaking change which adds functionality)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices applies)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have signed the commit for DCO to be passed.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

Dependency

• Please add the links to the dependent PR need to be merged before this (if any).
  Litmus Plugin for Backstage #4023

Special notes for your reviewer:

[gdsoumya]

+1 on this, as a reference, I'd suggest taking a look at ArgoCD proposal template, it has been there for some time and seems to work pretty well.

[Saranya-jena]

@gdsoumya Can you PTAL?

[gdsoumya]

LGTM