feat: Add firt bug template proposal

The outcome of the related discussion will determine whether this
proposal gets merged or not.

Refs: [discussion](https://github.com/nishanb/CK-X/discussions/15_)

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,101 @@
+---
+name: "🐛 Bug Report"
+about: Report a bug or issue you've found while using CK-X Simulator
+title: "[Bug] <short description>"
+labels: bug
+assignees: ''
+
+---
+
+## Describe the bug
+
+<!-- A clear and concise description of what the bug is.
+
+Why does it bother you, and how could it be harmful for the user?
+
+-->
+
+## Report in Depth
+
+<!-- Please describe the bug clearly.
+Try answering this question:
+
+- What exactly happens?
+- Why does it bother you or impact the user experience?
+- When did you first notice it?
+- Does it happen consistently or only sometimes?
+- Which part of the system is affected? (e.g., web UI, evaluator, virtual cluster)
+- Does this bug prevent you from completing a lab or exercise?
+
+-->
+
+## Steps to reproduce
+
+<!-- Is this bug reproducible?
+
+If so, uncomment and fill out one of the following:
+
+Steps to reproduce the behavior:
+
+1. Go to `...`
+2. Click on `...`
+3. See error
+
+Or use a code block, if you prefer:
+
+```
+...
+```
+
+-->
+
+## Expected Behavior
+
+<!-- What you expected to happen? -->
+
+## Actual Behaviour
+
+<!-- What actually happened instead? -->
+
+## Screenshots / Logs
+
+<!-- If applicable, add screenshots or relevant logs.
+
+For logs, use a code block or (better) a log file.
+
+-->
+
+## Workaround
+
+<!-- Have you found a workaround?
+
+If so, please describe the steps you followed to temporarily solve the issue.
+
+Use an ordinated list, like so:
+
+1. Go to `...`
+2. Run: `...`
+3. Paste this: `...`
+...
+
+Or use a code block if you prefer:
+
+```
+...
+```
+
+-->
+
+## Environment (please complete the following):
+
+<!--
+- OS: [e.g. Ubuntu 22.04, Windows 11]
+- Browser: [e.g. Chrome 112]
+- CK-X Version: [e.g. v1.2.0 or commit SHA]
+- Docker version: `docker version`
+- How did you install CK-X? [installer script / manual / other]
+-->
+
+## Additional context
+
+<!-- Add any other context or details here. -->