Added ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+# Issue template
+
+### Prerequisites
+- [ ] I have searched the issue tracker to check if the issue has already been reported.
+
+### Version
+[Which version of the game did the bug happen in. Also, please include the operating system you're using (Windows/Linux/Mac).]
+
+### Description
+[Describe the issue here]
+
+### Steps to reproduce
+[If possible, describe how the developers can reproduce the issue. It is often extremely hard to fix a bug if we don't know how to make it happen.]
+
+### Additional information
+[Any additional information that might be helpful in fixing the issue. Save files, submarine files, screenshots, etc...]