- adds pull request template

Author: baywet

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+<!-- Read me before you submit this pull request
+
+First off, thank you for opening this pull request! We do appreciate it.
+
+The requests and models for this client library are generated. We won't be accepting pull requests for those code files. With that said, we do appreciate
+it when you open pull requests with the proposed file changes, as we'll use that to help guide us in updating our template files.
+
+-->
+
+<!-- Optional. Set the issues that this pull request fixes. Delete 'Fixes #' if there isn't an issue associated with this pull request. -->
+Fixes #
+
+<!-- Required. Provide specifics about what the changes are and why you're proposing these changes. -->
+### Changes proposed in this pull request
+-
+
+<!-- Optional. Provide related links. This might be other pull requests, code files, StackOverflow posts. Delete this section if it is not used. -->
+### Other links
+-