Create README.md

docker/README.md

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+# Dokerfile for Cerberus nodes
+
+You can use those Dockerfiles in order to build your own image.
+
+## Parameters
+
+They all support those 2 build parameters in order to specify the VNC Password to use and the version of the robot extension to use 
+
+* VNC_PASSWORD=XXXXXXXX
+* CERBERUS_ROBOT_EXTENSION_VERSION=1.7.1
+
+## List of available images 
+
+| image | Description |
+| --- | --- |
+| nodeChrome | **Chrome** Selenium node. Based on **Selenium 3**. Will build against **latest** available version of Chrome. |
+| nodeFirefox | **Firefox** Selenium node. Based on **Selenium 3**. Will build against **latest** available version of Chrome. |
+
+## Instruction on how to build your own image:
+
+    docker build -t my-chrome-node:latest \
+    --build-arg="VNC_PASSWORD=XXXXXXX" --build-arg="CERBERUS_ROBOT_EXTENSION_VERSION=XXXXXXXXX" \
+    PATH_TO_DOCKERFILE_FOLDER
+
+Examples :
+
+Chrome image with VNC debug password to 1OA1GjLv3PCTou48 and Cerberus Robot Extension to latest SNAPSHOT
+
+    docker build -t my-chrome-node:latest \
+    --build-arg="VNC_PASSWORD=1OA1GjLv3PCTou48" --build-arg="CERBERUS_ROBOT_EXTENSION_VERSION=SNAPSHOT" \
+    PATH_TO_DOCKERFILE_FOLDER
+
+Firefox image with VNC debug password to 1OA1GjLv3PCTou48 and Cerberus Robot Extension to latest 1.7.1
+
+    docker build -t my-chrome-node:latest \
+    --build-arg="VNC_PASSWORD=1OA1GjLv3PCTou48" --build-arg="CERBERUS_ROBOT_EXTENSION_VERSION=1.7.1" \ 
+    PATH_TO_DOCKERFILE_FOLDER