Adds Issue Templates to Issues

.github/ISSUE_TEMPLATE/1_Bug_report.md

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+---
+name: 🐛 Bug Report
+about: Report errors and problems
+
+---
+
+**ISIS version(s) affected**: x.y.z
+
+**Description**  
+<!-- A clear and concise description of the problem. -->
+
+**How to reproduce**  
+<!-- Code and/or config needed to reproduce the problem. -->
+
+**Possible Solution**  
+<!--- Optional: only if you have suggestions on a fix/reason for the bug -->
+
+**Additional context**  
+<!-- Optional: any other context about the problem: log messages, screenshots, etc. -->

.github/ISSUE_TEMPLATE/2_Feature_request.md

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+---
+name: 🚀 Feature Request
+about: RFC and ideas for new features and improvements
+
+---
+
+**Description**  
+<!-- A clear and concise description of the new feature. -->
+
+**Example**  
+<!-- A simple example of the new feature in action (include code, links to necessary data, etc.)
+     If the new feature changes an existing feature, include a simple before/after comparison. -->
+

.github/ISSUE_TEMPLATE/3_Support_question.md

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+---
+name: ⛔ Support Question
+about: See https://astrodiscuss.usgs.gov for questions about using ISIS3 and other
+Astrogeology Science Center software.
+
+---
+
+We use GitHub issues only to discuss about ISIS3 bugs and new features. For
+questions about using ISIS3 or other ASC software, please use
+any of the support alternatives: https://astrodiscuss.usgs.gov or https://gitter.im/USGS-Astrogeology/IAA
+
+Thanks!

.github/ISSUE_TEMPLATE/4_Documentation_issue.md

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+---
+name: ⛔ Documentation Issue
+about: Report issues or problems with documentation.
+
+---
+
+**Description**
+<!-- A clear and concise description of the problem. -->
+
+**Suggested Edit**
+<!--- Optional: only if you have suggestions on a fix for the documentation -->
+
+Thanks!