Add sample code

doc.go

diff --git a/doc.go b/doc.go
index 445dc55..dddd5f8 100644
--- a/doc.go
+++ b/doc.go
@@ -1,6 +1,26 @@
 /*
 Package logrus is a structured logger for Go, completely API compatible with the standard library logger.
 
+
+The simplest way to use Logrus is simply the package-level exported logger:
+
+  package main
+
+  import (
+    log "github.com/Sirupsen/logrus"
+  )
+
+  func main() {
+    log.WithFields(log.Fields{
+      "animal": "walrus",
+      "number": 1,
+      "size":   10,
+    }).Info("A walrus appears")
+  }
+
+Output:
+  time="2015-09-07T08:48:33Z" level=info msg="A walrus appears" animal=walrus number=1 size=10
+
 For a full guide visit https://github.com/Sirupsen/logrus
 */
 package logrus