message: updates to the docker readme
diff: - To build the Docker image,
  ```bash
  -docker build -t cylon .
  +docker build -t cylondata/cylon .
  ```
  - To run a container
  ```bash
  -docker run -it cylon
  +docker run -it cylondata/cylon
  +```
  +## Running Cylon Examples
  +
  +Start a container.
  +
  +```bash
  +docker run -it cylondata/cylon
  ```
  +
  +Execute a python example locally
  +
  +```bash
  +python3 /cylon/python/examples/dataframe/data_loading.py /cylon/data/input/csv1_0.csv
  +```
  +
  ## Re-building Cylon
  This docker conatiner comes with pre-built cylon binaries. Below steps should be followed if you want to change the core code and re-build Cylon core.
  @@ -28,17 +42,3 @@ cd $CYLON_HOME && ./build.sh -pyenv $CYLON_ENV -bpath $CYLON_BUILD --cpp --pytho
  ```bash
  cd $CYLON_HOME && ./build.sh -pyenv $CYLON_ENV -bpath $CYLON_BUILD --cpp --test --python --pytest --release
  ```
  -
  -## Running Cylon Examples
  -
  -Start a container.
  -
  -```bash
  -docker run -it cylondata/cylon
  -```
  -
  -Execute a python example locally
  -
  -```bash
  -python3 /cylon/python/examples/dataframe/data_loading.py /cylon/data/input/csv1_0.csv
  -```
  