Generate entropy for random number generation

What was done:

• Entropy was generated through a time delta of keypresses
• Mersenne Twister was used to generate a Pseudo Random Number using the Keypress Entropy

What else could be done:

• Add additional sources of entropy such as, mouse movement or network traffic monitering
• Calculate randomness of entropy and block number generation on insuficent entropy
• Allow multiple numbers to be generated from the entropy created

Note: No external libraries needed, Node v8.x.x used in testing

Usage:

• In project root node index.js
• Randomly type on keyoard
• Hit the return (enter) key