Suggestion: Building from source shoud point Install.md

[dimitre]

Instead of contributing.md
https://fontforge.org/en-US/downloads/source/
https://github.com/fontforge/fontforge/blob/master/INSTALL.md
I can make a PR if you agree.

In fact i like the way the OpenFrameworks project put it, they named INSTALL_FROM_GITHUB.md
so it is in your face
https://github.com/openframeworks/openFrameworks/blob/master/INSTALL_FROM_GITHUB.md

It would be great to have instructions to build the python module and the binary program with interface too.

[dimitre]

Just completing there is a broken link here
https://fontforge.org/en-US/developers/
pointing to INSTALL-git.md

[jtanx]

Feel free to submit pr