Add a Dockerfile and document usage in README

Author: madisonmay

.gitignore

@@ -1,2 +1,3 @@
 __pycache__
 models/
+samples

Dockerfile

@@ -0,0 +1,20 @@
+FROM tensorflow/tensorflow:1.12.0-gpu-py3
+
+# nvidia-docker 1.0
+LABEL com.nvidia.volumes.needed="nvidia_driver"
+LABEL com.nvidia.cuda.version="${CUDA_VERSION}"
+
+# nvidia-container-runtime
+ENV NVIDIA_VISIBLE_DEVICES=all \
+    NVIDIA_DRIVER_CAPABILITIES=compute,utility \
+    NVIDIA_REQUIRE_CUDA="cuda>=8.0" \
+    LANG=C.UTF-8
+
+RUN apt-get update && mkdir /gpt-2
+ADD requirements.txt /gpt-2/requirements.txt
+RUN pip3 install -r /gpt-2/requirements.txt
+
+WORKDIR /gpt-2
+ADD . /gpt-2
+
+CMD ["sleep", "infinity"]