docs: add PULL_REQUEST_TEMPLATE.md for consistent PR descriptions

[rafaumeu]

Summary

Adds a PULL_REQUEST_TEMPLATE.md to standardize PR descriptions. Currently the plugin has no PR template, but reviewers consistently expect Summary, Changes, Release Notes, and a link to the related issue.

Changes

• Added .github/PULL_REQUEST_TEMPLATE.md with sections:
  • Summary (what and why)
  • Changes (bullet list)
  • Ticket / Issue link (Resolves #NNN)
  • Release Notes (release-note or release-note-none)
  • Screenshots
  • Testing steps
  • Checklist

Ticket / Issue

No specific issue — this is a developer experience improvement.

Testing

• Verified the template renders correctly on GitHub by creating a test PR from the fork
• Template follows Mattermost contribution patterns observed in existing PRs

Checklist

• Changes follow the project's code style guidelines
• Self-review completed
• Documentation updated (if applicable)
• New tests added (if applicable)
• All existing tests pass
• Release notes included (or release-note-none)

Change Impact: 🟢 Low

Reasoning: This is a docs-only update that adds a pull request template and does not change runtime code, APIs, or shared logic. The blast radius is isolated to contributor workflow and has negligible regression potential.

Regression Risk: Very low; no application behavior, persistence, or critical paths are affected, and the change is limited to repository metadata used when creating PRs.

QA Recommendation: Manual QA is not required. A quick visual check on GitHub for template rendering is sufficient.
Generated by CodeRabbitAI

[mattermost-build]

Hello @rafaumeu,

Thanks for your pull request! A Core Committer will review your pull request soon. For code contributions, you can learn more about the review process here.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: d4ffd390-5863-48f7-9d45-13e43b9dc72d

📥 Commits

Reviewing files that changed from the base of the PR and between f49b3c1 and aacc5af.

📒 Files selected for processing (1)

• .github/PULL_REQUEST_TEMPLATE.md

---

📝 Walkthrough

Walkthrough

This PR adds a new GitHub pull request template file (.github/PULL_REQUEST_TEMPLATE.md) that provides a standardized structure for PR descriptions, including sections for summary, detailed changes, ticket reference, release notes, screenshots, testing notes, and a checklist.

Changes

PR Template Addition

Layer / File(s)	Summary
Pull request template .github/PULL_REQUEST_TEMPLATE.md	Adds standard PR template sections and a checklist covering style, self-review, docs, tests, and release notes.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A template hops into the repo today,
Guiding contributors along the way,
Checkboxes lined like carrots in a row,
With docs and tests all set to go,
Thump thump—review time's here to stay! 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a pull request template for consistent descriptions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}