adding issue and pull request templates

Author: joshfraser

.github/ISSUE_TEMPLATE.md

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+If you need help, please ask in our [#engineering channel on Discord](http://www.originprotocol.com/discord).
+
+We use issues for tracking features, bugs and discussions.

.github/PULL_REQUEST_TEMPLATE.md

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+First pull request? Read our [guide to contributing](http://docs.originprotocol.com/#contributing)
+
+### Checklist:
+
+- [ ] Code contains relevant tests for the problem you are solving
+- [ ] Ensure all new and existing tests pass
+- [ ] Update any relevant READMEs and [docs](https://github.com/OriginProtocol/docs)
+
+### Description:
+
+Please explain the changes you made here:
+
+- A description of the problem you're trying to solve
+- An overview of the suggested solution
+- If the feature changes current behavior, reasons why your solution is better