add README file to docker folder of son-emu

diff --git a/utils/docker/README.md b/utils/docker/README.md
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+++ b/utils/docker/README.md
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+# Docker build scripts for son-emu
+
+This directory holds the Dockerfile to build son-emu as a docker container.
+This is an easy way to deploy son-emu.
+The docker container can be pulled from sonatanfv on Docker Hub.
+`docker pull sonatanfv/son-emu`
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