Update issue templates

Author: machinaut

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,31 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Error Messages**
+Including more/longer error messages gives us more information to work with.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. macOS 10.13.6]
+ - Python Version [e.g. 3.6.6]
+ - Mujoco Version [e.g. 1.50]
+ - mujoco-py version [e.g. 1.50.1.59]
+
+**Environment**
+ - output of: `echo $LD_LIBRARY_PATH`
+ - output of: `echo $HOME`
+ - output of: `echo $USER`
+
+**Additional context**
+Add any other context about the problem here.