update readme

docker/README.md

diff --git a/docker/README.md b/docker/README.md
index 105a530..ddd12f3 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -1,3 +1,3 @@
-copy this Dockerfile file to the mixer repo root
-cp the mixs and mixc binary to mixer repo root (since bazel builds binary in tmp directory outside the mixer root, this step is needed)
-docker build
+- copy this Dockerfile file to the mixer repo root
+- cp the mixs and mixc binary to mixer repo root (since bazel builds binary in tmp directory outside the mixer root, this step is needed)
+- docker build