Added readme for dockers.

Former-commit-id: 2407eaf

docker/README.md

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+Provided dockerfiles (all images use ubuntu 16.04):
+
+* **python3** - python3, vizdoom with dependecies and X11 support. By default runs [basic example](examples/python/basic.py).
+* **tensorflow** - python3, vizdoom with dependecies, tensorflow and X11 support. By default runs [tensorflow learning example](examples/python/learning_tensorflow.py).
+* **torch** - TODO
+
+# Building
+```bash
+# Uses Dockerfile in python3 directory to create image tagged vizdoom
+docker build python3 -t vizdoom 
+
+
+# Uses Dockerfile in tensorflow directory to create image tagged vizdoom_tf
+docker build tensorflow -t vizdoom_tf 
+
+```
+# Running (requires building beforehand)
+
+```
+# Run basic example in container named 'basic' ('--net=host -e DISPLAY=${DISPLAY'} is needed for X11) 
+docker run  -t --net=host -e DISPLAY=${DISPLAY} --rm --name basic vizdoom
+
+# Run tensorflow learning example in container named 'vizdoom_tf' ('--net=host -e DISPLAY=${DISPLAY'} is needed for X11)
+docker run  -t --net=host -e DISPLAY=${DISPLAY} --rm --name vizdoom_tf vizdoom_tf
+
+```