Add issue templates (#34)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐞 Bug report
+about: Create a report to help us improve Plash
+labels: bug
+---
+
+**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.
+
+**Info**
+
+ - macOS version: 
+ - Plash version: 
+
+**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 Plash
+labels: enhancement
+---
+
+**Is your feature request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is. For example, 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.