Add issue templates (#687)

Signed-off-by: Peter Goetz <pego@amazon.com>

Signed-off-by: Peter Goetz <pego@amazon.com>

.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.
+
+**Steps to reproduce the behavior**
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+This can also include a verbatim copy of outputs, or screenshots.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Version information:**
+ - DoWhy version [e.g. 0.7]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/enhancement-or-enhancement-request.md

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+---
+name: Enhancement or enhancement 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.md

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+---
+name: Question
+about: Ask a question
+title: ''
+labels: question
+assignees: ''
+
+---
+
+**Ask your question**
+A clear and concise question, potentially including what was tried and what was observed. This can also include a verbatim copy of outputs, or screenshots.
+
+**Expected behavior**
+If applicable, a clear and concise description of what you expected to happen.
+
+**Version information:**
+ - DoWhy version [e.g. 0.7]
+
+**Additional context**
+Add any other context about the problem here.