Added a basic auto-setup script for mac os and some setup guides

[amoghnatu]

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What is the purpose of the pull request

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This PR adds a basic auto-setup script for mac os users. Additionally, it adds a setup guide, and a quick reference guide of useful commands, and provides explaination to some of the steps documented.

Brief change log

• Adds a new setup-macos.sh file that automates setting up a development environment on mac os for XTable devs.
• Adds MACOS_SETUP_GUIDE.md that explains each command used for setup. Can be used as a DIY guide for step-by-step setup.
• Adds QUICK_REFERENCE.md for quick reference of useful commands
• Adds a relevant README.md
• Updated root README.md to reference to these new setup guides.

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