Execution
 - Simply run the starter script `run.sh`
 - Results are stored in `src/results.txt` after the program completes


File Descriptions
- Dockerfile: configuration file for building Spark Docker image
- scripts: directory that stores scripts for initializing working components in Spark cluster
- src
  - bigramCount.py: the bigramCount program
  - text.txt: testing data
  - run.sh: start the program
- start-master.sh: a wrapper script to start a Master node container
- start-worker.sh: a wrapper script to start a Worker node container