Create bug and addition issue templates (#668)

* Create bug and addition issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+<!--- Provide a general summary of the bug you're experiencing in the Title above -->
+
+
+## Detailed Description
+<!--- Provide a detailed description of the bug you are experiencing - tell us what you expected to happen, and what happened instead of that -->
+
+
+## To Reproduce
+<!--- Describe the steps that lead to experiencing the bug -->
+
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in, such as the following bullet points -->
+* Version of Parsons used (if you know):
+* Environment name and version (e.g. Chrome 39, node.js 5.4):
+* Operating System and version (desktop or mobile):
+
+
+## Additional Context
+Add any other context about the problem here.
+
+
+## Priority
+Please indicate whether fixing this bug is high, medium, or low priority for you. If the issue is time-sensitive for you, please let us know when you need it addressed by.

.github/ISSUE_TEMPLATE/proposed-feature-addition.md

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+<!--- Provide a general summary of the proposed Parsons addition in the Title above -->
+
+
+## Detailed Description
+<!--- Provide a detailed description of the change or addition you are proposing -->
+
+
+## Context
+<!--- Why is this change important to you? How would you use it? -->
+<!--- How can it benefit other users? -->
+
+
+## Possible Implementation
+<!--- Not obligatory, but suggest an idea for implementing addition or change -->
+
+
+## Priority
+<!--- Please indicate whether adding this feature is high, medium, or low priority for you. If the issue is time-sensitive for you, please let us know when you want it addressed by. -->