Merge pull request #3 from creativecommons/otf-gen

Add "OTF File Compilation" section to README

Author: TimidRobot

README.md

@@ -13,6 +13,17 @@ Also see the launch article: [Introducing CC Accidenz Commons: An Open-Licensed
 [blogpost]: https://creativecommons.org/2019/10/28/accidenz-commons-open-licensed-font/
 
 
+## OTF File Compilation
+
+The OpenType font (OTF) file can compiled from the Unified Font Object (UFO)
+source directory with `fontmake`:
+```shell
+fontmake --validate-ufo -u CC\ Accidenz\ Commons-medium.ufo -o otf --output-path CCAccidenzCommons-medium.otf
+```
+- [googlefonts/fontmake](https://github.com/googlefonts/fontmake): Compile
+  fonts from sources (UFO, Glyphs) to binary (OpenType, TrueType).
+
+
 ## License
 
 [![CC BY-SA 4.0 license button][cc-by-sa-png]][cc-by-sa]