Added Android library (#1943)
Added Android library (#1943)

* Added Android library 

Added a link to the android library for katex rendering.

* Update the name to include correct capitalization

xymostech/KaTeX,xymostech/KaTeX,Khan/KaTeX,Khan/KaTeX,xymostech/KaTeX,Khan/KaTeX,xymostech/KaTeX,xymostech/KaTeX