Set up issue templates

Add bug report and feature request templates.

Potential to add deploy checklist or other templates as useful.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Describe a problem to help us improve Colouring London
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the problem**
+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 short description of what you expected to happen.
+
+**Screenshots**
+If it helps to explain the problem, add screenshots.
+
+**More information**
+Add any other context about the problem here - which browsers or devices show it, whether it's only started happening recently...

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,17 @@
+---
+name: Feature request
+about: Suggest an idea
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the solution**
+A clear and concise description of what you want to happen.
+
+**Describe any alternatives**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Other context or background information.