added readme

Author: rainer@software-architects.at

TypeScriptES2015/Readme.md

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+# What's New in TypeScript 1.5?
+
+This folder contains sample I created for an article for the German [Windows Developer](https://entwickler.de/) magazine. It covers:
+
+* TypeScript's new module syntax which is not compatible with ECMAScript 2015
+* Destructuring
+* The new keywords `let` and `const`
+* The new `for..of` loop
+* Samples for decorators (will be part of ECMAScript 2016)
+* TypeScript's new computed properties syntax
+