Create README.md

Author: simonvpe

yocto/README.md

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+# Example
+The `yocto` script mounts the current directory and adds a user with the same guid and uuid as the current user, then it starts a bash shell into the docker container.
+```bash
+starlord@host $ docker build -t yocto .
+starlord@host $ alias yocto=$(pwd)/yocto
+starlord@host $ yocto bash
+yocto@deadbeef $ git clone git://git.yoctoproject.org/poky.git
+yocto@deadbeef $ source poky/oe-init-build-env
+yocto@deadbeef $ time bitbake core-image-base
+```