Add synopsis & description

Author: Shimuuar

dense-linear-algebra/dense-linear-algebra.cabal

@@ -1,8 +1,11 @@
 name:                dense-linear-algebra
 version:             0.1.0.0
--- synopsis:
--- description:
-homepage:            https://github.com/githubuser/dense-linear-algebra
+synopsis:            Simple and incomplete pure haskell implementation of linear algebra
+description:
+  This library is simply collection of linear-algebra related modules
+  split from statistics library.
+
+-- homepage:            https://github.com/githubuser/dense-linear-algebra
 license:             BSD3
 license-file:        LICENSE
 author:              Author name here