Improve README.md

[tomatocat]

Is your feature request related to a problem? Please describe. The readme saying "step projcct" is not exactly informative

Describe the solution you'd like README should migrate information over from the "project info" internal Google doc:

• How to install dependencies and set up development environment
• How to run development server
• Deploying

It should also explain the project structure:

• Folder structure
• Languages and frameworks used

[tomatocat]

Screenshots to use