Added docker file for Liota Docker image

Docker image/Dockerfile

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+FROM alpine
+RUN apk add --update \
+    python \
+    py-pip \
+    --no-cache bash \
+	&& pip install liota

Docker image/README.md

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+# Liota Docker Image
+Liota Docker image is a light weight image based on Alpine Linux. 
+### Base Image
+Built using [Alpine base image](https://github.com/gliderlabs/docker-alpine).
+### Includes following components: 
+ - Python
+ - Python-pip
+ - Liota
+
+### How to use image:
+  - Now do `docker build -t liota .` in terminal Docker image will be created by the name liota.
+    Note: Incase of problem in building the image please configure DNS address before building the image.
+  - Now to run the image `docker run -it liota`
+
+You can refer to the [Examples](https://github.com/vmware/liota/blob/master/README.md#examples) for more details on how to use liota. 	
+You can also use a mounted device or drive from where liota will pick the data  `docker run -it -v /path/to/mount-device:/mnt/ liota`.
+You will have to write your own UDM's in order to get that data from that mount-device and send to DCC's.