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
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior. If possible, include example data. At the very least, explain what the input data was and provide the `umi_tools` command used.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment**
+ - OS: [e.g. iOS]
+ - UMI-tools version [e.g. 1.1.3]
+ - How was UMI-tools installed (e.g pip/conda etc)
+
+**Additional context**
+Add any other context about the problem here. Was UMI-tools being run within another pipeline, etc.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is this something you propose to solve/implement, or is this a request?**
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. 
+
+**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 or have implemented. What are the limitations of this approach compared to what you are requesting/implementing?
+
+**Additional context**
+Add any other context or screenshots about the feature request here.