Update ISSUE_TEMPLATE.MD
Add template info for version, OS, etc
<!--- If this is a bug please attach the Archi Error Log - this can be accessed in Archi by selecting the "About Archi" menu item. In the dialog box press the "Installation Details" button, then select the "Configuration" tab and press the "View Error Log" button. If you able to attach a *.archimate file that causes the error, please also attach that. --->
+### Version of Archi, Operating System
+<!--- Which version of Archi are you using? Are you on Windows, Mac, Linux? Version of these? -->
+
### Expected Behaviour
<!--- Tell us what should happen -->
