update docs

README.md

@@ -1,6 +1,7 @@
 # negotiator
 [![Build Status](https://travis-ci.org/DavidCai1993/negotiator.svg?branch=master)](https://travis-ci.org/DavidCai1993/negotiator)
 [![Coverage Status](https://coveralls.io/repos/github/DavidCai1993/negotiator/badge.svg)](https://coveralls.io/github/DavidCai1993/negotiator)
+
 An HTTP content negotiator for Go
 
 ## Installation

doc.go

@@ -0,0 +1,45 @@
+// Package negotiator is an HTTP content negotiator for Go.
+//
+// Accept:
+//
+// // Assume that the Accept header is "text/html, application/*;q=0.9, image/jpeg;q=0.8"
+// negotiator.Accept([]string{"text/html", "application/json", "image/jpeg"})
+// // -> "text/html"
+//
+// negotiator.Accept([]string{"application/json", "image/jpeg", "text/plain"})
+// // -> "application/json"
+//
+// negotiator.Accept([]string{"text/plain"})
+// // -> ""
+//
+// Encoding:
+//
+// // Assume that the Accept-Encoding header is "gzip, compress;q=0.2, identity;q=0.5"
+//
+// negotiator.Encoding([]string{"identity", "gzip"})
+// // -> "gzip"
+//
+// negotiator.Encoding([]string{"compress", "identity"})
+// // -> "identity"
+//
+// Language:
+//
+// // Assume that the Accept-Language header is "en;q=0.8, es, pt"
+//
+// negotiator.Language([]string{"en", "es", "fr"})
+// // -> "es"
+//
+// negotiator.Language([]string{"es", "pt"})
+// // -> "es"
+//
+// Charset:
+//
+// // Assume that the Accept-Charset header is "utf-8, iso-8859-1;q=0.8, utf-7;q=0.2"
+//
+// negotiator.Charset([]string{"utf-8", "iso-8859-1", "iso-8859-5"})
+// // -> "utf-8"
+//
+// negotiator.Charset([]string{"iso-8859-5"})
+// // -> ""
+
+package negotiator