Merge pull request rust-lang#7 from Aeyk/patch-1

Update README.md

Author: wycats

README.md

@@ -1,3 +1,16 @@
+## Compiling cargo
+
+You'll want to clone cargo using --recursive on git, to clone in it's submodule dependencies.
+```
+$ git clone --recursive https://github.com/carlhuda/cargo
+```
+or
+```
+$ git submodule init
+$ git submodule upgrade
+```
+Then it's as simple as ```make``` and you're ready to go.
+
 ## Porcelain
 
 ### cargo-compile