Add a bug report template

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,24 @@
+---
+name: Bug Report
+about: Create a bug report to improve aptdec
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behaviour.
+
+**Expected behaviour**
+A clear description of what you expected to happen.
+
+**Link to audio**
+A link to the audio that caused the problem.
+
+**Build information**
+The commit of aptdec you are running (check with `git rev-parse HEAD`), make sure it's up to date before opening this issue.
+And whether you are using GNU automake or CMake.