Create issue_template.md

issue_template.md

+### Expected behaviour
+Tell us what should happen
+
+### Actual behaviour
+Tell us what happens instead
+
+### Steps to reproduce:
+1. 
+2. 
+3. 
+
+###Server configuration
+Webserver: 
+
+PHP version:
+
+### Client configuration
+Browser:
+
+Operating system:
+
+### Logs
+####Webserver error log:
+
+```
+Insert your webserver log here
+
+```
+
+####ownCloud log (data/owncloud.log):
+
+```
+Insert your ownCloud log here
+
+```
+
+####Browser error log:
+```
+Insert your browser error log here
+
+```