Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help us improve dask-sql
+title: "[BUG]"
+labels: "bug"
+assignees: ''
+
+---
+
+<!-- Please include a self-contained copy-pastable example that generates the issue if possible.
+
+Please be concise with code posted. See guidelines below on how to provide a good bug report:
+
+- Craft Minimal Bug Reports http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports
+- Minimal Complete Verifiable Examples https://stackoverflow.com/help/mcve
+
+Bug reports that follow these guidelines are easier to diagnose, and so are often handled much more quickly.
+-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**Minimal Complete Verifiable Example**:
+
+```python
+# Put your MCVE code here
+```
+
+**Anything else we need to know?**:
+
+**Environment**:
+
+- dask-sql version:
+- Python version:
+- Operating System:
+- Install method (conda, pip, source):

.github/ISSUE_TEMPLATE/documentation-request.md

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+---
+name: Documentation request
+about: Report incorrect or needed documentation
+title: "[DOC]"
+labels: "documentation"
+assignees: ''
+
+---
+
+## Report incorrect documentation
+
+**Location of incorrect documentation**
+Provide links and line numbers if applicable.
+
+**Describe the problems or issues found in the documentation**
+A clear and concise description of what you found to be incorrect.
+
+**Steps taken to verify documentation is incorrect**
+List any steps you have taken:
+
+**Suggested fix for documentation**
+Detail proposed changes to fix the documentation if you have any.
+
+---
+
+## Report needed documentation
+
+**Report needed documentation**
+A clear and concise description of what documentation you believe it is needed and why.
+
+**Describe the documentation you'd like**
+A clear and concise description of what you want to happen.
+
+**Steps taken to search for needed documentation**
+List any steps you have taken:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for dask-sql
+title: "[ENH]"
+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 wish I could use dask-sql to do [...]
+
+**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, code examples, or references to existing implementations about the feature request here.

.github/ISSUE_TEMPLATE/submit-question.md

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+---
+name: Submit question
+about: Ask a general question about dask-sql
+title: "[QST]"
+labels: "question"
+assignees: ''
+
+---
+
+**What is your question?**