Create pull_request_template.md

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+### Proposed change(s)
+- Describe the changes made in this PR.
+
+### Screenshot
+
+
+### Useful links (Github issues, JIRA tickets, ML-Agents forum threads etc.)
+
+
+### Types of change(s)
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Code refactor
+- [ ] Breaking change
+- [ ] Documentation update
+- [ ] Other (please describe)
+
+### Checklist
+- [ ] Added tests that prove my fix is effective or that my feature works
+- [ ] Updated the documentation (if applicable)
+
+### Other comments