Added README.md

Author: jared

README.md

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+# prelude-typescript
+
+A Prelude for TypeScript.
+
+The primary motivation for this is to provide a Haskell-like runtime system for
+[LambdaBuffers](https://github.com/mlabs-haskell/lambda-buffers), but this may
+find interest elsewhere. It implements type classes via dictionary passing where
+the programmer must manually pass the desired instance to functions requiring
+such a type class.
+
+The following functionality has been implemented.
+
+- `Eq`, `Ord`, and `JSON` instances for various types.
+
+- `Map` and `Set` containers where keys are ordered by a given `Ord` instance
+
+- `JSON` serializers and deserializers which can parse large numbers.