Add prettier

[samwambam]

Description

Added prettier to the project with "npm install --save-dev --save-exact prettier". Added a command in the scripts to run prettier on all files that end with js, jsx, json, css, md.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Testing Instructions

• In the terminal, head to the "neptune-app" folder, and run "npm run prettier"

[samwambam]

Have not configured prettier rules yet