create ISSUE_TEMPLATE.md

Author: WebFreak001

ISSUE_TEMPLATE.md

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+<!--
+
+Please check if your issue happens with a simple hello world project and send it in this issue.
+
+If it is a formatting issue, it is probably related to dfmt. Possibly the embedded dfmt version in serve-d/workspace-d might be outdated.
+
+If you are experiencing crashes, abnormal behaviour, etc. please open the Output panel in vscode and open the `code-d & serve-d` output. Please copy this log in a code block into this issue like this:
+
+```
+output here
+```
+
+If you can live with some sensitive information such as file paths and entire contents of files being shared, please go into your user settings and set `"serve-d.trace.server": "verbose"` (it will show it can't find it, but just ignore it). Also try to reproduce with a simple hello world project and send the output of it instead as it will be a lot smaller.
+
+-->