Add issue template

Author: airsquared

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,18 @@
+---
+name: Bug report
+about: Create a bug report
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is and the expected behavior.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. macOS Mojave]
+ - App version [e.g. 1.1.1]
+
+**Crash log**
+If applicable, paste the crash log here.