[cantarell-fonts: 5/109] Add build instructions.

[Nikolaus Waxweiler <nwaxweiler src gnome org>]

commit 9b682dbe8c5711f0bad2d25bf948ee505e8768e2
Author: Nikolaus Waxweiler <madigens gmail com>
Date:   Sun Jul 23 23:09:35 2017 +0200

    Add build instructions.

 README.md |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/README.md b/README.md
index e457fd4..bf76de0 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,17 @@ This file provides detailed information on the Cantarell font software. This
 information should be distributed along with the Cantarell fonts and any
 derivative works.
 
+## Build instructions
+
+```
+pip3 install fontmake --user
+pip3 install -e git+https://github.com/khaledhosny/psautohint#egg=psautohint --user
+
+meson build
+cd build
+ninja install
+```
+
 ## Font Information
 
 The Cantarell typeface family is a contemporary Humanist sans serif, and is