Add documentation

README.md

@@ -9,4 +9,4 @@ See https://docs.docker.com/installation/#installation on how to get Docker.
 docker build -t ffdobuild .
 docker run ffdobuild
 ```
-
+After a successful build you can remove the used container. Use `docker ps -a` to find the container ID and `docker rm <container>` to remove the container. Use `docker rmi ffdobuild` to remove the image used to create the container.

docker/build.sh

@@ -18,5 +18,5 @@ time make -j $(($(nproc)+1)) GLUON_TARGET=ar71xx-generic
 
 set +x
 echo -e "\nBUILD FINISHED\n"
-echo "You can copy the resulting images from the conatiner using:"
+echo "You can copy the resulting images from the container using:"
 echo -e "\ndocker cp ${HOSTNAME}:/usr/src/build/gluon/images <destination>\n"