doc: created README for Docker folder (#266)

Docker/README.md

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+# Running Dalle-mini With Docker
+
+This folder contains the Dockerfile needed to build a Docker image that can easily run Dalle-mini.
+
+## Inference
+
+Steps to run inference with Dalle-mini are as follows:
+
+1. Build the docker image with ```dalle-mini/Docker/build_image.sh```
+2. Run the container with ```dalle-mini/run_docker_image```
+3. Navigate to ```/workspace/tools/inference/``` and run ```run_infer_notebook.sh```
+4. Click the Jupyter Notebook link and run through the notebook.
+
+### Inference Video Tutorial
+
+Alteratively check out a video tutorial on how to run Dalle-mini on [Linux](https://www.youtube.com/watch?v=eWpzLIa6v9E&t=9s) and [Windows](https://www.youtube.com/watch?v=OqEuEe-xSKk&t=59s)