Reworked introduction text and more formatting changes for GitHub stylesheet.
Reworked introduction text and more formatting changes for GitHub stylesheet.

KhanSuleyman/scikit-neuralnetwork,freakynit/scikit-neuralnetwork,IndraVikas/scikit-neuralnetwork,gticket/scikit-neuralnetwork,agomariz/scikit-neuralnetwork,aigamedev/scikit-neuralnetwork,capitancambio/scikit-neuralnetwork