Add installation instructions

README.md

diff --git a/README.md b/README.md
index f1e7374..63b1cca 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,14 @@
 and use this library to decode it into the proper underlying native Go
 structure.
 
+## Installation
+
+Standard `go get`:
+
+```
+$ go get github.com/mitchellh/mapstructure
+```
+
 ## Example
 
 ```go