Update README.md

README.md

@@ -1,7 +1,41 @@
-# gomerkle
+# Gomerkle
 [![Build Status](https://travis-ci.org/onrik/gomerkle.svg?branch=master)](https://travis-ci.org/onrik/gomerkle)
 [![Coverage Status](https://coveralls.io/repos/github/onrik/gomerkle/badge.svg?branch=master)](https://coveralls.io/github/onrik/gomerkle?branch=master)
 [![GoDoc](https://godoc.org/github.com/onrik/gomerkle?status.svg)](https://godoc.org/github.com/onrik/gomerkle)
 [![Go Report Card](https://goreportcard.com/badge/github.com/onrik/gomerkle)](https://goreportcard.com/report/github.com/onrik/gomerkle)
 
 Golang Merkle tree implementation
+
+## Usage
+```go
+package main
+
+import (
+    "crypto/sha256"
+
+    "github.com/onrik/gomerkle"
+)
+
+func main() {
+    data := [][]byte{
+        []byte("Buzz"),
+        []byte("Lenny"),
+        []byte("Squeeze"),
+        []byte("Wheezy"),
+        []byte("Jessie"),
+        []byte("Stretch"),
+        []byte("Buster"),
+    }
+    tree := gomerkle.NewTree(sha256.New())
+    tree.AddData(data...)
+
+    err := tree.Generate()
+    if err != nil {
+        panic(err)
+    }
+
+    // Proof for Jessie
+    proof := tree.GetProof(4)
+    println(tree.VerifyProof(proof, tree.Root(), data[4]))
+}
+```