Update issue templates (#206)

* Update issue templates: Bug Report, Questions and Enhancement templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. 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.
+
+**Schemachange (please complete the following information):**
+- Version (e.g. 3.5.3): x.x.x
+
+**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: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**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-or-clarification.md

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+---
+name: Question or Clarification
+about: Need help with getting a functionality to work OR seeking workarounds for a
+  situation you are facing
+title: How do I .... ?
+labels: question, Workaround
+assignees: ''
+
+---
+
+** What are you trying to accomplish? **
+Describe what you are trying to accomplish with SchemaChange
+
+** What options have you tried so far ? **
+Share any steps, examples, solutions (include links, if possible) you have tried.