Add Github issue templates

Add basic templates for users to follow so that we get the information
we need directly in the initial report.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**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.
+
+**Client (please complete the following information):**
+ - OS: [e.g. Windows 8.1]
+ - VNC client: [e.g. TigerVNC, or UltraVNC]
+ - VNC client version: [e.g. 1.8.0]
+ - Client downloaded from: [e.g. my Linux distribution]
+
+**Server (please complete the following information):**
+ - OS: [e.g. Windows 8.1]
+ - VNC server: [e.g. TigerVNC, or UltraVNC]
+ - VNC server version: [e.g. 1.8.0]
+ - Server downloaded from: [e.g. my Linux distribution]
+ - Server was started using: [e.g. `vncserver`]
+
+**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
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. 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.