Create initial issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Python Version [e.g. 3.4]
+ - PyMuscle Version [e.g. 0.01]
+
+
+**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
+
+---
+
+**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/research-submission.md

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+---
+name: Research Submission
+about: Submit a reference to new or existing research.
+
+---
+
+**What aspect of the model do you feel should be changed?**
+A clear and concise description of what the issue with the current behavior and how you feel it should be changed.
+
+**Describe the expected impact on the performance of the library here.**
+
+**Please link to supporting research papers here.**
+(Do not submit sci-hub links, sci-hub is too convenient and useful and is bad for other reasons too)
+
+**Additional context**
+Add any other context or screenshots about the proposal here.