* Fixed references to the custom shape generation script in the
oox/README.md to use generate.sh instead of README.md
* Added README.md to oox/source/drawingml/customshapes folder
* Moved documentation parts from the script to the README.md
The README script was renamed to generate.sh before in the commit
59577dbb84
Change-Id: Id167b32c7a101806c33126ea1642a0194d693231
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/119376
Tested-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>
Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>