README - tell reader to `cd` into the cloned `storm-docker` repository
README - tell reader to `cd` into the cloned `storm-docker` repository

Because the subsequent commands must be executed from that folder.

Signed-off-by: Pang Yan Han <9d8a3bce71455786d192cd4b985538c54e03f109@viki.com>

viki-org/storm-docker,viki-org/storm-docker