Add a github issue template to the project (#3071)

ISSUE_TEMPLATE.md

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+## Description
+
+Provide a description of your issue.
+For any suggestions, please address them on the [forum](https://forum.freegamedev.net/viewforum.php?f=16).
+
+## Steps to reproduce
+
+## Configuration
+
+STK release version:
+
+STK Source (ppa, distribution package, official bin,...):
+If you did not download STK from the official website, please specify where you got it:
+
+System: 
+
+Graphics card: 
+
+CPU: 
+
+Gamepads/keyboards models if related to the issue:
+
+## Additional information
+
+Please provide stdout.log, it is located in
+
+* %appdata%\supertuxkart\0.8.2 (windows)
+* ~/Library/Application Support/supertuxkart/0.8.2 (mac)
+* $XDG_CONFIG_HOME/supertuxkart/0.8.2 or ~/.config/supertuxkart/0.8.2 (linux, and other unix based systems)
+
+stdout.log
+```
+
+```
+
+If your issue is related to the input config (gamepads, keyboards), please provide your file input.xml located in the same directory as stdout.log.
+
+input.xml
+```xml
+
+```
+
+
+If an error message was shown, please copy paste the complete error message or a screenshot of it.
+
+error
+```
+
+```