Add issue and pull-request templates

.github/ISSUE_TEMPLATE.md

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+
+_Describe the problem. Please make sure you can reproduce the bug. It's also
+helpful to include screenshots or animated gifs of the problem._
+
+### Steps to Reproduce
+
+_Explain what someone needs to do in order to see what's described above. The 
+more detailed and eplicit the steps are the better._
+
+### Operating System and Browser
+
+_e.g. Mac OS 10.11.6 Safari 10.0_

.github/PULL_REQUEST_TEMPLATE.md

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+### Resolves
+
+_What Github issue does this resolve (please include link)? Please do not submit
+PRs that only partially implement an issue._
+
+### Changes
+
+_Describe what this Pull Request does_
+
+### Test Coverage
+
+_Please show how you have added tests to cover your changes 
+or describe how you have tested the changes (include a screenshot if possible)._