/usr/share/SuperCollider/Extensions/README is in supercollider-common 1:3.8.0~repack-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | The "Extensions" folder provided by SuperCollider is initially empty.
Packages will add class extensions and/or plugins into this folder.
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