Add default issue template

.github/ISSUE_TEMPLATE.md

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+Please read https://github.com/VCVRack/Rack/issues/730 before posting any code or terminal output. Fill out the following form for your issue type.
+
+# For bug reports
+
+Operating system(s):
+Version of Rack if using official binary, or commit hash and branch if compiling from source:
+All hardware relevant to your issue (e.g. graphic card model, audio/MIDI device):
+
+# For feature requests
+
+# For discussions