add README and LICENSE, and copyright headers

README.md

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+**Lamb** is a toy dynamically typed functional programming language
+
+It's not meant for real-world use but for educational purposes on writing an interpreter with pattern matching in Haskell.
+
+**Features**
+
+* No re-assignment (i.e., once you bind a value, you can't re-assign it)
+* Pattern matching
+    f([]) -> "nothing".
+    f([a]) -> one thing".
+* Imperative I/O
+* Higher-order functions
+* Partial evaluation on curried functions
+
+** Hello World! **
+
+`examples/helloworld.lamb`:
+
+    hello(object) -> object + "!".
+    hello() -> "hello, " + hello("world").
+    
+    putstrln(hello()).
+
+** License **
+
+Licensed under the terms of the zlib license. See `LICENSE` for details.