Tweak Compose example in README

Author: robbyoconnor

README.md

@@ -86,6 +86,8 @@ services:
     volumes:
       - /tmp/ccache:/ccache
       - ~/aosp:/aosp
+      - ~/.gitconfig:/home/aosp/.gitconfig
+      - ~/.ssh/:/home/aosp/.ssh/
 ```
 Example run: `docker-compose run --rm aosp repo sync -j4` -- your android build directory will be in `~/aosp`.