[recipes] Update README.md

[Matthias Clasen <matthiasc src gnome org>]

commit 5c80db0cc319373f800ca7d61b90271d82ca0e52
Author: matthiasclasen <matthias clasen gmail com>
Date:   Mon Dec 5 11:49:26 2016 -0500

    Update README.md
    
    Add building and testing instructions.

 README.md |   34 ++++++++++++++++++++++++++++++++++
 1 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/README.md b/README.md
index 7e1f4db..b257931 100644
--- a/README.md
+++ b/README.md
@@ -15,3 +15,37 @@ The main objects of interest are
 - chefs
 
 The design can be found here: https://wiki.gnome.org/Design/Apps/Potential/Recipe%20App
+
+Building
+--------
+
+To build GNOME Recipes from git, use the following steps:
+
+```
+git clone https://github.com/matthiasclasen/gr.git
+cd gr
+./autogen.sh --prefix=<your preferred location>
+make
+make install
+```
+I list `make install` as the last step here, but Recipes works fine uninstalled as well.
+
+Testing
+-------
+
+If you don't feel like building from source yourself, you can use Flatpak, like this:
+
+```
+flatpak install --from https://alexlarsson.github.io/test-releases/gnome-recipes.flatpakref
+```
+
+or using a Flatpak bundle:
+
+```
+flatpak install --bundle 
https://github.com/matthiasclasen/gr/releases/download/0.2.0/org.gnome.Recipes.x86_64.flatpak
+```
+After installing the Flatpak with either method, the applications will show up in the GNOME shell overview, 
but you can also launch it from the commandline:
+
+```
+flatpak run org.gnome.Recipes
+```