add README file

README

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+README
+======
+
+Korat Golang Compiler, KGC.
+Copyright (c) 2011 Chanwit Kaewkasi / SUT.
+
+This program is a front-end compiler for 8g and GCCGO.
+It additionally supports the following language constructs
+  - trait
+  - case struct
+  - pattern matching
+
+Trait
+=====
+
+type Object trait {}
+
+
+Case struct
+===========
+
+type Something  casestruct {
+    left  Object
+    right Object
+}
+type SomeObject casestruct borrows Object {}
+
+
+Pattern Matching
+================
+
+match s {
+    case Something(x, SomeObject(y)):
+        return Some(x,y)
+    case Something(SomeObject(), x):
+        return Some(x)
+}