Create ISSUE_TEMPLATE

.github/ISSUE_TEMPLATE

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+[!] Before you report an issue, check if if has already been reported. Also check if you are using the latest version of Blockbench.
+[!] Prefix the title if your issue with [Issue] or [Suggestion]
+[!] If you are having an issue, please press "Ctrl + Shift + i" and click on console. If there are any error messages, please attach a screenshot of it to your issue.
+
+Supply the following information:
+- Detailed description of your issue
+- Blockbench variant (Webapp/Desktop)
+- Operating System