meta: add issue template

.github/FUNDING.yml

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+github: [vincenzopalazzo]
+custom: https://bruce.lnmetrics.info/donation
+custom: 3KTHcpN8oJpHuCz9HbBcYruW4SySmxonDy

.github/ISSUE_TEMPLATE/bug_report.md

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+<!--
+## Issue Template for lampo.rs
+
+### Description
+
+**Please provide a detailed description of the issue or feature request.**
+
+---
+
+### Steps to Reproduce
+
+1. **Step one**
+2. **Step two**
+3. **Step three**
+
+**Provide as much detail as possible, including code snippets, commands, or screenshots that can help us reproduce the issue.**
+
+---
+
+### Expected Behavior
+
+**What did you expect to happen?**
+
+---
+
+### Actual Behavior
+
+**What actually happened?**
+
+---
+
+### Logs
+
+**If applicable, add screenshots to help explain your problem. You can also paste any logs here.**
+
+---
+
+### Environment
+
+- **OS**: (e.g., Windows, macOS, Linux)
+- **Version/Commit**: (e.g., v1.0.0, commit abc1234)
+
+---
+
+### Additional Context
+
+**Add any other context about the problem here.**
+
+-->