Add Github templates

.github/ISSUE_TEMPLATE.md

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+## Overview
+**TL;DR**
+<One to two sentence description of the issue you are encountering.>
+
+### Extra Detail
+
+#### Steps to reproduce
+1.
+2.
+3.
+#### Screenshots
+<please upload images of the error to better showcase the problem.>
+
+#### Logs
+<please upload logs of the error to better showcase the problem.>
+
+#### Context (Environment)
+* OS:
+* Embark Version:
+* Node Version:
+* NPM Version:
+
+### Questions?
+- Leave a comment on this issue! Make sure to use @ mentions if you want a specific person's attention!

.github/PULL_REQUEST_TEMPLATE.md

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+## Overview
+**TL;DR**
+<One to two sentence description of the issue you are encountering or trying to solve.>
+
+### Questions
+<If relevant, write a list of questions that you would like to discuss related to the changes that you have made.>
+
+### Review
+<use @mentions for quick questions, specific feedback, and progress updates.>