.github: Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bugs
+about: Crashes and other bugs
+labels: 'bug'
+
+---
+
+### Useful information:
+Please, try to gather as much of useful information as possible.
+
+- **Version:**
+  - `wayvnc -V`
+
+- Try to reproduce while capturing a **trace log:**
+  - `wayvnc -Ltrace | tee wayvnc-crash.log`
+
+- Get the **stack trace**:
+  - If have `coredumpctl`, you can gather the stack trace after a crash using
+    `coredumpctl gdb wayvnc` and then run `bt full` to obtain the stack trace.
+  - Otherwise, you can either locate the core file and load it into gdb or run
+    wayvnc in gdb like so:
+    - `gdb --args wayvnc -Ltrace`
+  - If the lines mentioning wayvnc, neatvnc or aml have `??`, please compile
+    wayvnc and those other projects from source with debug symbols and try
+    again.
+
+- Describe how to **reproduce** the problem

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions
+    url: "https://github.com/any1/wayvnc/discussions"
+    about: "Please ask questions on IRC in #wayvnc on Libera Chat or in Discussions"

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancements
+about: New functionality
+labels: 'enhancement'
+
+---