Add --config flag to support a config.json file

[lmpham1]

Description

Add --config/-c command-line flag to allow usage of a config.json file to configure command-line options

Initial Plan

• Add --config/-c flag to the command-line argument parser
• Parse the config.json file to retrieve the configurations and apply them to the program
• Make sure other options are ignored if the config option is used
• Handle missing, invalid or unsupported configurations
• Add the documentation to README.md

Please let me know if you have any questions or suggestions regarding my approach