add(doc): add issue template

.github/issue_template.md

@@ -0,0 +1,22 @@
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Launch bot
+3. Type command '...'
+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.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. Debian]
+ - Python Version [e.g. 3.7.4]
+
+**Additional context**
+Add any other context about the problem here.