add github templates

.github/issue_template.md

@@ -0,0 +1,14 @@
+### Expected behavior
+Tell us what should happen
+
+### Actual behavior
+Tell us what happens instead
+
+### Steps to reproduce
+Show a way to reproduce
+
+### System configuration
+
+**Ruby version**:
+
+**Rails version**:

.github/pull_request_template.md

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+### Summary
+
+Provide a general description of the code changes in your pull
+request... were there any bugs you had fixed? If so, mention them. If
+these bugs have open GitHub issues, be sure to tag them here as well,
+to keep the conversation linked together.
+
+### Other Information
+
+If there's anything else that's important and relevant to your pull
+request, mention that information here. This could include
+benchmarks, or other information.
+
+If you are updating any of the CHANGELOG files or are asked to update the
+CHANGELOG files by reviewers, please add the CHANGELOG entry at the top of the file.
+
+Finally, if your pull request affects documentation or any non-code
+changes, guidelines for those changes are [available
+here](https://github.com/jonhue/nestive-rails/blob/master/CONTRIBUTING.md)
+
+Thanks for contributing to `nestive-rails`!