Add templates for PR and Issues

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: Bug report
+about: Report a bug in GMSO
+
+---
+
+**Bug summary**
+
+What were you trying to do and what happened instead? Please copy and paste the stack output
+
+
+**Code to reproduce the behavior**
+
+Please include a code snippet that can be used to reproduce this bug.
+
+```python
+# Paste your code here
+#
+#
+```
+
+**Software versions**
+
+- Which version of GMSO are you using? (`python -c "import gmso; print(gmso.__version__)"`)
+- Which version of Python (`python --version`)?
+- Which operating system?

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: Feature request
+about: Suggest an improvement to GMSO
+
+---
+
+**Describe the behavior you would like added to GMSO**
+A clear and concise description of what the proposed idea 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.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/QUESTION.md

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+---
+name: Questions/discussions
+about: For usage questions, important notes, and other discussions.
+
+---
+
+**A summary of the question or discussion topic.**

.github/PULL_REQUEST_TEMPLATE.md

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+### PR Summary:
+
+### PR Checklist
+------------
+ - [ ] Includes appropriate unit test(s)
+ - [ ] Appropriate docstring(s) are added/updated
+ - [ ] Code is (approximately) PEP8 compliant
+ - [ ] Issue(s) raised/addressed?