[Good first issue]: Update README and include example links

The current README should include links (like Table of Contents) to the examples in the directories.

For example:

Get Started with Go

Let's install Go on your favorite operating system.

• OS X
• Windows
• Linux (Ubuntu)

Write Your First Program

• Let's get started.
• Exercise 1: Print names — Check this out for further instructions — [Solution]
• Question 1: Gopath.
• Question 2: Code your first program.
• Question 3: Run your first program.

Please contribute and add the other examples, exercises, and questions.