Add pr template (#275)

Author: MIchaelMainer

.github/pull_request_template.md

@@ -0,0 +1,13 @@
+## Summary
+
+Give a description of what your pull request does and what platform[s] it targets. Use the *breaking changes* tag if applicable. Breaking changes can include changes to generated code files which will impact API signature or behaviors, and changes to directory structures which may impact DevOp pipelines and scripts.
+
+## Generated code differences
+
+Pull requests that result in changes to generated code and/or directory structures should include example diffs of the resulting changes. This makes code review much easier.
+
+## Command line arguments to run these changes
+
+Provide the command line arguments here so that reviewers can quickly repro the results of changes.
+
+## Links to issues or work items this PR addresses