doc: add link on badges (#607)

Signed-off-by: Gadfly <[email protected]>

Author: gadfly3173

README.md

@@ -1,6 +1,10 @@
 # SourceGit - Opensource Git GUI client.
 
-![stars](https://img.shields.io/github/stars/sourcegit-scm/sourcegit.svg) ![forks](https://img.shields.io/github/forks/sourcegit-scm/sourcegit.svg) ![license](https://img.shields.io/github/license/sourcegit-scm/sourcegit.svg) ![latest](https://img.shields.io/github/v/release/sourcegit-scm/sourcegit.svg) ![downloads](https://img.shields.io/github/downloads/sourcegit-scm/sourcegit/total)
+[![stars](https://img.shields.io/github/stars/sourcegit-scm/sourcegit.svg)](https://github.com/sourcegit-scm/sourcegit/stargazers)
+[![forks](https://img.shields.io/github/forks/sourcegit-scm/sourcegit.svg)](https://github.com/sourcegit-scm/sourcegit/forks)
+[![license](https://img.shields.io/github/license/sourcegit-scm/sourcegit.svg)](LICENSE)
+[![latest](https://img.shields.io/github/v/release/sourcegit-scm/sourcegit.svg)](https://github.com/sourcegit-scm/sourcegit/releases/latest)
+[![downloads](https://img.shields.io/github/downloads/sourcegit-scm/sourcegit/total)](https://github.com/sourcegit-scm/sourcegit/releases)
 
 ## Highlights