add some issue templates

Author: n2ygk

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug, docs, api
+assignees: ''
+
+---
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**
+<!-- Steps to reproduce the behavior -->
+
+**Expected behavior**
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Version**
+<!-- Version of django-oauth-toolkit -->
+
+<!-- Have you tested with the latest version and/or master branch? -->
+- [ ] I have tested with the latest published release and it's still a problem.
+- [ ] I have tested with the master branch and it's still a problem.
+
+**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, good first issue, docs, help-wanted
+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 about using django-oauth-toolkit
+title: ''
+labels: question, help-wanted
+assignees: ''
+
+---
+
+<!-- What is your question? -->
+
+