Update issue templates

Add issue template [skip ci]

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Got a bug? Let's hear about it
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is. Please note that Gluegun is community-supported, so submitting a PR to fix this bug would be greatly appreciated. We will prioritize reviewing and releasing bugfixes.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Create a CLI with '...'
+2. Add this code '....'
+3. Run the CLI with '....'
+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.
+
+**Doctor (please complete the following information):**
+ - OS: [e.g. macOS 12.0.1]
+ - Gluegun Version [e.g. 5.0.1]
+
+**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
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Note that Gluegun is community-supported and the core team will not be adding new features other than those submitted as PRs by the community.**
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. Gluegun doesn't work very well 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.