docs: Updated readme file and add contributing and release file

[Mansi-mParticle]

Instructions

1. PR target branch should be against development
2. PR title name should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-title-check.yml
3. PR branch prefix should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-branch-check-name.yml

Summary

• Updated README.md with consistent formatting. Added CONTRIBUTING.md to define contribution guidelines. Added RELEASING.md to document the release process.To standardize documentation structure with other repositories.

Testing Plan

• Was this tested locally? If not, explain why.
• {explain how this has been tested, and what, if any, additional testing should be done}

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes https://go/j/SDKE-265

[BrandonStalnaker]

LGTM

[mparticle-automation]

🎉 This PR is included in version 8.40.0 🎉

The release is available on GitHub release

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