Brush up readme

Author: matklad

README.md

@@ -5,8 +5,8 @@
 
 libsyntax2.0 is an **experimental** implementation of the corresponding [RFC](https://github.com/rust-lang/rfcs/pull/2256).
 
-See `docs` folder for more details and contribution instructions.
-
+See [`docs`](./docs) folder to learn how libsyntax2 works, and check 
+[`CONTRIBUTING.md`](./CONTRIBUTING.md) if you want to contribute!
 
 
 ## License