Add PR template (With changes)

[fadkeabhi]

Description

This PR adds new pull request and issue templates to project. The templates provide structured guidelines for contributors, ensuring that necessary information is included in PRs.
I had already opened a PR for same, but it had some issues. Now I have implemented changes suggested by @wirthual in current PR.

Old Pull Request

#417

Related Issue

#416

Type of Change

• Bug fix
• New feature
• Documentation update

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• I have added tests to cover my changes. (Not applicable for documentation changes)
• All new and existing tests passed. (Not applicable for documentation changes)
• My changes generate no new warnings.
• I have updated the documentation accordingly.

License

By submitting this PR, I confirm that my contribution is made under the terms of the MIT license.

[greptile-apps]

PR Summary

This PR adds comprehensive issue and pull request templates to standardize contribution formats, including bug reports, feature requests, model additions, and general pull requests.

• Added .github/pull_request_template.md with structured sections for description, changes, and MIT license confirmation
• Added .github/ISSUE_TEMPLATE/bug-report.yml with detailed system info collection and reproduction steps
• Added .github/ISSUE_TEMPLATE/feature-request.yml for capturing feature proposals and motivation
• Added .github/ISSUE_TEMPLATE/new-model-addition.yml specifically for model implementation requests
• Added .github/ISSUE_TEMPLATE/config.yml to enable blank issues alongside templates

_{1 file(s) reviewed, 2 comment(s)
Edit PR Review Bot Settings | Greptile}

[greptile-apps]

style: The CONTRIBUTING link points to the readme tab which may break. Consider using direct link to contribution.md instead

[greptile-apps]

style: Consider adding '(if applicable)' to test-related items since some changes (like docs) don't need tests

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.18%. Comparing base (7328a6e) to head (a2a3c4a).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #441   +/-   ##
=======================================
  Coverage   79.18%   79.18%           
=======================================
  Files          41       41           
  Lines        3248     3248           
=======================================
  Hits         2572     2572           
  Misses        676      676           

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