Add issue and PR templates for contributors

.github/ISSUE_TEMPLATE.md

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+### Expected behavior
+
+_Please describe what should happen_
+
+### Actual behavior
+
+_Describe what actually happens_
+
+### Steps to reproduce
+
+_Explain what someone needs to do in order to see what's described in *Actual behavior* above_
+
+### Operating system and browser
+
+_e.g. Mac OS 10.11.6 Safari 10.0_

.github/PULL_REQUEST_TEMPLATE.md

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+### Type of change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Refactor
+- [ ] "Chore" (changes to build script, updates to README, etc.)
+
+### Proposed changes
+
+_Describe what this Pull Request does_
+
+### Reason for changes
+
+_Explain why these changes should be made. Please include an issue # if applicable._