Add issue and pull request templates [skip ci]

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to raise an issue
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Before posting a bug report, please ensure you test using tox in an isolated
+manner.
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Describe the steps necessary to reproduce the behavior. Preferably, a minimal
+example.
+
+1. 
+2. 
+3. 
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+
+If applicable, add screenshots to help explain your problem.
+
+**System**
+
+Please complete the following information:
+
+- Python versions tested
+- Operating system
+- Terminal/console name, version etc.
+- tox/pytest versions if applicable

.github/PULL_REQUEST_TEMPLATE.md

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+Fixes #.
+
+# Proposed Changes
+
+Describe your proposed changes and why you think they are necessary.