TypeScript page created

Wrote the tutorial for TypeScript
I think that in the case of TypeScript it is fair to call it duck typing (give the lack of clear definition of duck typing anyway), and that's how official documentation refers to it too (http://www.typescriptlang.org/Handbook#interfaces) and how Anders Hejlsberg refers to it too - which is sufficient to convince me :-)

Anyway, removed it :-)