Update issue templates

Add blank issue, feature request, and bug report issue templates.

.github/ISSUE_TEMPLATE/blank-issue-template.md

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+---
+name: Blank Issue Template
+about: The standard issue template for Chayn
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Overview
+Clearly state the purpose of this issue, ideally in 2 sentences or less.
+For example: *_We need to do X for Y reason._*
+
+### Action Items
+List research to be done or the steps to be completed.
+Note: If the steps can be divided into tasks for more than one person, we recommend dividing it up into separate issues, or assigning it as a pair programming task.
+
+### Resources
+Provide links to resources that may help solve or better understand with this issue. This can include external sites with solutions, documentation, etc.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Is your feature request related to a problem?
+Please provide a clear and concise description of what the problem is. 
+*Ex. I'm always frustrated when [...]*
+
+### Describe a solution:
+If applicable, please a detailed description of what you want to see or build to fix the problem. Include who wants it (e.g. yourself, a survivor, volunteer, developer, organization, etc.), and what value you think this will bring.
+
+### Additional context and resources:
+Add any other context, documents, links, screenshots about the feature request here. Please be detailed!