[Content]: Add content/resources about terminal/shell usage in basics

[skellet0r]

It's important that dapp developers understand how to use the command line if they want to develop dapps. We shouldn't assume individuals viewing the content already know or have pre-requisite knowledge.

Content should probably cover:

• Git Bash installation (for windows)
• Accessing the terminal (Windows/OSX/Linux)
• Basic commands
  • ls
  • mkdir
  • mv
  • cd
  • touch
  • rm

[tesla809]

Welp, jump the gun on that. I added common git commands, commit workflow and npm/yarn commands. I need to add common shell commands.

[tesla809]

Added bash commands and setup instructions for macOS.