Create issue template

Try to guide people into including more information with their bug reports.

Author: liquidpele

issue_template.md

@@ -0,0 +1,16 @@
+### Summary:
+
+Include a *brief* descrioption of the problem here, and fill out the version info below.  
+
+* Celery Version: 
+* Celery-Beat Version: 
+
+### Exact steps to reproduce the issue:
+1. 
+2. 
+3. 
+
+### Detailed information
+
+Please include more detailed information here, such as relevant information about your system setup, things you did to try and debug the problem, log messages, etc.  
+