add texture generation scripts from https://github.com/zeuner/signs-font-generate

util/README.md

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+# signs-font-generate
+
+This is a collection of helper shell scripts to create textures for
+international characters to be used with the
+[signs_lib](https://gitlab.com/VanessaE/signs_lib) Minetest mod.
+
+They currently expect the
+[Liberation Fonts](https://github.com/liberationfonts/liberation-fonts) to be
+installed at "/usr/share/fonts/truetype/liberation".
+
+ImageMagick is also required.
+
+## Basic usage
+
+sh create-signs-lib-overlay.sh <signs_lib_directory> <language-code>
+
+For example, this command will write textures for the non-ASCII characters
+of the French language to "/home/user/signs_lib":
+
+sh create-signs-lib-overlay.sh /home/user/signs_lib fr
+
+Currently, there is support for German (de), French (fr) and Polish (pl)
+non-ASCII characters.
+
+## Character alignment
+
+I chose the image processing parameters in order fairly match the alignment of
+the existing signs_lib textures. In order to get even better alignment at
+the expense of slightly smaller textures, it is possible to also replace
+existing ASCII character textures:
+
+sh write-ascii.sh <signs_lib_texture_directory>
+
+For example, with signs_lib residing at "/home/user/signs_lib":
+
+sh write-ascii.sh /home/user/signs_lib/textures