Create pull_request_template.md

Author: ashitaprasad

.github/pull_request_template.md

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+## PR Description
+
+_Add your description_
+
+## Related Issues
+
+- Related Issue #
+- Closes #
+
+### Checklist
+- [ ] I have gone through the [contributing guide](https://github.com/foss42/apidash/blob/main/CONTRIBUTING.md)
+- [ ] I have run the tests (`flutter test`) and all tests are passing
+
+## Added/updated tests?
+_We encourage you to add relevant test cases._
+
+- [ ] Yes
+- [ ] No, and this is why: _please replace this line with details on why tests have not been included_
+- [ ] I need help with writing tests