Created issue templates (#949)

* Created issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: 'Type: Bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Configure '...'
+2. Run '....'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please provide the following information):**
+ - OS: [e.g. Windows, Linux, macOS,...]
+ - SRT Version / commit ID:
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FR]"
+labels: 'Type: Enhancement'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. For example: "When I try to do X, I am blocked by Y..."
+
+**Describe the solution you'd like**
+A clear and concise description of how you would like to see this feature implemented.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question regarding SRT
+title: ''
+labels: 'Type: Question'
+assignees: ''
+
+---
+
+When asking a question please also include where you looked for an answer (so we can update the documentation if needed).
+
+You are encouraged to ask general questions regarding SRT in the [SRT Alliance Slack channel](https://slackin-srtalliance.azurewebsites.net/).