Create README.MD

Signed-off-by: Henri Gomez <henri.gomez@gmail.com>

contrib/apache/README.MD

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+# Apache HTTPd sample for Registry v1, v2 and mirror
+
+3 containers involved 
+
+* Docker Registry v1 (registry 0.9.1)
+* Docker Registry v2 (registry 2.0.0)
+* Docker Registry v1 in mirror mode
+
+HTTP for mirror and HTTPS for v1 & v2
+
+* http://registry.example.com proxify Docker Registry 1.0 in Mirror mode
+* https://registry.example.com proxify Docker Registry 1.0 or 2.0 in Hosting mode
+
+## 3 Docker containers should be started 
+
+* Docker Registry 1.0 in Mirror mode : port 5001
+* Docker Registry 1.0 in Hosting mode : port 5000
+* Docker Registry 2.0 in Hosting mode : port 5002
+
+### Registry v1
+
+    docker run -d -e SETTINGS_FLAVOR=dev -v /var/lib/docker-registry/storage/hosting-v1:/tmp -p 5000:5000 registry:0.9.1"
+
+### Mirror
+
+    docker run -d -e SETTINGS_FLAVOR=dev -e STANDALONE=false -e MIRROR_SOURCE=https://registry-1.docker.io -e MIRROR_SOURCE_INDEX=https://index.docker.io \
+                  -e MIRROR_TAGS_CACHE_TTL=172800 -v /var/lib/docker-registry/storage/mirror:/tmp -p 5001:5000 registry:0.9.1"
+
+### Registry v2
+
+    docker run -d -e SETTINGS_FLAVOR=dev -v /var/lib/axway/docker-registry/storage/hosting2-v2:/tmp -p 5002:5000 registry:2.0"
+
+# For Hosting mode access
+
+* users should have account (valid-user) to be able to fetch images
+* only users using account docker-deployer will be allowed to push images