Enable IP/Domain Name access. Create detailed README.md

[qqq89513]

This pull request fixes the problem when accessing the page with IP address, instead of localhost.
In the console of Chrome, you would see:

script.js:10 Uncaught TypeError: Cannot read property 'getUserMedia' of undefined

Modified repo that has SSL connection

Thanks to @WebDevSimplified, creating this [tutorial video]. It saves me so much time to build a webRTC project.
Now I hope those one in the issue zone could ever get some help of SSL connection.

• Enable ssl(https) connection based on this issue

  • Most of the browsers block camera access with http, which is insecure connection.
  • Generating a key and applying it to https server fix the problem.

• Create a detailed README.md, including

  • mentioning original repo and video
  • package installation
  • key generation
  • execution