Create ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+item                    | info       | notes
+------------------------|------------|---------------------------------------------------------------------------------------------
+**node** version        |            | *output from `node --version`*
+**npm** version         |            | *output from `npm --version`*
+**mozaik-demo** version |            | *git ref of the demo*
+**browser**             |            | *browser used, applyable if the issue is not related to the client*
+
+## Expected behavior
+
+*Description of the expected behavior.*
+
+## Actual behavior
+
+*Description of the actual behavior.*
+
+## Steps to reproduce
+
+*Description of the various steps required to reproduce the error.*