Create issue templates (#848)

.github/ISSUE_TEMPLATE/ask-a-question.md

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+---
+name: Ask a question
+about: Have you checked that your question hasn't already been answered ?
+title: ''
+labels: question
+assignees: ''
+
+---
+
+**Question**
+<!-- Ask your question here -->

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help us improve Snips NLU
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**
+<!-- Please provide steps and data to reproduce the issue, with a minimal example if possible -->
+
+**Expected behavior**
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Environment:**
+ - OS:
+ - python version:
+ - snips-nlu version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature-request
+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. -->