Update issue template

.github/ISSUE_TEMPLATE.md

@@ -1,2 +1,16 @@
-OS (if applicable):
-Version (or "dev" if compiling from source):
+Search before opening an issue to make sure your topic is not a duplicate.
+Delete this text and only include the form for this issue's type below.
+Please follow the formatting guidelines at https://github.com/VCVRack/Rack/issues/730
+
+## For bug reports:
+
+Operating system, or "all" if known to exist on all three:
+Version if official Rack release, commit hash and/or branch if from source:
+
+## For feature requests:
+
+No form, but please consider that the `time to implement` must be much greater than the `time saved by the user`, otherwise it will be closed.
+
+## For discussions:
+
+Clear everything here and start writing. :)