Add GitHub issue templates (#361)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,43 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- The more information you supply, the more likely it is that I can diagnose and resolve the issue. Bug reports without information may be neglected or closed. I may not have the energy and motivation to resolve bugs at any given time, so if I don't respond, feel free to poke me every few weeks. -->
+
+<!-- (Optional) A clear and concise description of what the bug is. -->
+
+## To Reproduce
+
+<!-- Steps to reproduce the behavior: -->
+
+- Open corrscope and add '...' (channels or master audio)
+- Click on '....'
+- ...
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Actual behavior
+
+<!-- What happens in practice. -->
+
+## Screenshots
+
+<!-- Taking a screenshot of the main GUI window will make it more likely that your issue can be diagnosed and fixed. If you see unusual messages in the terminal, screenshot it as well. -->
+
+## Version
+
+- OS: <!-- e.g. Windows 10 x64 -->
+- Corrscope version:
+- How you installed corrscope: <!-- official Windows binaries, pip, poetry, etc. -->
+- How you obtained FFmpeg: <!-- Linux package manager, in-app download, etc., unknown -->
+
+## 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: enhancement
+assignees: ''
+
+---
+
+**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.

.github/ISSUE_TEMPLATE/support-feedback.md

@@ -0,0 +1,10 @@
+---
+name: Support/feedback
+about: Ask about the UI or code, or propose an improvement
+title: "[SUPPORT] "
+labels: support
+assignees: ''
+
+---
+
+<!-- For quick questions or unstructured discussion, feel free to contact via Discord at https://discord.gg/CCJZCjc . -->

README.md

@@ -17,7 +17,7 @@ Documentation is available at https://corrscope.github.io/corrscope/.
 
 ## Status
 
-Corrscope is currently in maintenance mode until further notice. The program basically works, but I may not respond to issues. Do not ask for technical support in the issue tracker; instead contact me at Discord (https://discord.gg/CCJZCjc). Pull requests may be accepted if they're clean.
+Corrscope is currently in maintenance mode until further notice. The program basically works, but I may not respond to issues. For technical support, contact me at Discord (https://discord.gg/CCJZCjc), or alternatively in the issue tracker (using the "Support/feedback" template). Pull requests may be accepted if they're clean.
 
 ## Dependencies