Add checkout directions to README
diff --git a/README.md b/README.md
index 7b3414e..0c33e00 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,28 @@
Mojo
====
+
+This repo uses gclient to manage dependencies, so to build things from this
+repo you have to first download depot_tools and make sure it is in your path
+
+http://www.chromium.org/developers/how-tos/install-depot-tools
+
+then create a file called '.gclient' that has the following contents:
+
+```
+solutions = [
+ { "name" : "src",
+ "url" : "https://github.com/domokit/mojo.git",
+ "deps_file" : "DEPS",
+ "managed" : False,
+ "safesync_url": "",
+ },
+]
+```
+
+
+then run 'gclient sync' from the directory containing the .gclient file.
+This will clone this repository into a subdirectory called 'src'. From that
+directory, you can then build by doing
+
+src$ gn gen out/Debug
+src$ ninja -C out/Debug mojo
