Update issue templates

Adds bug report template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,36 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug, un-confirmed
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Logs**
+If applicable, add minetest's debug.txt to help show your problem.
+
+**Version (please complete the following information):**
+- Device: [e.g. Iphone6, Samsung Galaxy A20]
+ - OS: [e.g. iOS, Linux, Android, Windows]
+ - Minetest: [e.g. 5.5.1, git hash]
+ - Chunk Keeper Version: [e.g. v1.0]
+
+**Additional context**
+Add any other context about the problem here.