Add docs

Author: termoshtt

src/impls/cholesky.rs

@@ -1,3 +1,4 @@
+//! Implements cholesky decomposition
 
 use lapack::c::*;
 use error::LapackError;

src/impls/mod.rs

@@ -1,4 +1,4 @@
-
+//! Implement trait bindings of LAPACK
 pub mod outer;
 pub mod qr;
 pub mod svd;