Create issue templates

Author: apdavison

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us fix problems
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behaviour, preferably providing a simple code example (if the error happens in the middle of some complex code, please try to find a simpler, minimal example that demonstrates the error), and showing the full traceback.
+
+If the error occurs when reading a file that you can't share publicly, please let us know, and we'll get in touch to discuss sharing it privately.
+
+**Expected behaviour**
+If the bug is incorrect behaviour, rather than an unexpected Exception, please give a clear and concise description of what you expected to happen.
+
+**Environment:**
+ - OS: [e.g. macOS, Linux, Windows]
+ - Python version
+ - Neo version
+ - NumPy version
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/confusing-documentation.md

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+---
+name: Confusing documentation
+about: Let us know if the documentation is confusing or incorrect
+title: ''
+labels: Documentation
+assignees: ''
+
+---
+
+**Which page is the problem on?**
+The URL of the documentation page where the problem is, and either copy-paste the confusing text (for a short section of text), or give the first few and last few words (for a long section).
+
+**What is the problem?**
+Is the documentation (a) confusing or (b) incorrect? In what way?
+
+**Suggestions for fixing the problem**
+If the documentation is confusing, can you suggest an improvement? If the documentation is incorrect, what should it say instead?

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea to improve Neo
+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.