Add pull request template to repo, with contribution checklist

.github/pull_request_template.md

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+## Related Issue
+
+Fixes #
+
+## Describe this PR
+
+A brief description of what this changes and why.
+
+## AI Tool Usage
+
+- [ ] No AI tools were used
+- [ ] AI tools were used (complete below)
+
+**If AI-assisted:**
+
+- Tool(s) used:
+- What was generated:
+- What you reviewed and changed:
+
+## Checklist
+
+- [ ] I have read the [Contributing Guide](https://github.com/OpenDroneMap/documents/blob/master/CONTRIBUTING.md)
+- [ ] PR is focused and small
+- [ ] I understand all code in this PR and can answer questions about it
+- [ ] No secrets, credentials, or sensitive data are included
+- [ ] Commit messages are descriptive
+
+## Testing
+
+- Test dataset(s) used (link to source, e.g. [ODMdata](https://github.com/OpenDroneMap/ODMdata) or a public download):
+- Command(s) run:
+- Logs from successful ODM run(s) (attach as file, gist, or paste relevant excerpt):
+- Notes on results (screenshots of outputs, comparisons before/after, anything reviewers should look at):