Create issue_template.md

issue_template.md

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+#### Your system information
+
+* Steam client version (build number or date): 
+* Distribution (e.g. Ubuntu): 
+* Opted into Steam client beta?: [Yes/No]
+* Have you checked for system updates?: [Yes/No]
+
+#### Please describe your issue in as much detail as possible:
+Describe what you _expected_ should happen and what _did_ happen. Please link any large code pastes as a [Github Gist](https://gist.github.com/)
+
+#### Steps for reproducing this issue:
+
+1. 
+2. 
+3.