add ts notice

Author: Klexx

README.md

@@ -23,7 +23,14 @@ var sha256 = require('tiny-sha256');
 
 var jsCode = sha256.code + 'alert(sha256("hello!"));';
 ```
+## In TypeScript
+
+```typescript
+import { sha256 }  from "/some/path/js-sha256/sha256.js";
+
+sha256("some string");
+```
 
 ## License
 
-This library is released as "public domain".  You can copy, modify, re-release and re-license, or incorporate into any other project without restriction of any kind.
+This library is released as "public domain".  You can copy, modify, re-release and re-license, or incorporate into any other project without restriction of any kind.