Documented the module

README.md

@@ -1,2 +1,43 @@
 # merkle-bitcoin
 Bitcoin-style merkle root generation.
+
+# Usage
+
+```
+npm install merkle-bitcoin
+```
+
+``` js
+var merkle = require('merkle-bitcoin');
+```
+
+# Examples
+
+#### Even number of transactions
+``` js
+// Generate the merkle root for block #80000
+var hashes = [
+  "c06fbab289f723c6261d3030ddb6be121f7d2508d77862bb1e484f5cd7f92b25",
+  "5a4ebf66822b0b2d56bd9dc64ece0bc38ee7844a23ff1d7320a88c5fdb2ad3e2"
+];
+
+merkle(hashes, function (err, merkleTree) {
+  console.log(merkleTree.root);
+  // 8fb300e3fdb6f30a4c67233b997f99fdd518b968b9a3fd65857bfe78b2600719 
+});
+```
+
+#### Odd number of transactions
+``` js
+// Generate the merkle root for block #50001
+var hashes = [
+    "e1882d41800d96d0fddc196cd8d3f0b45d65b030c652d97eaba79a1174e64d58",
+    "7940cdde4d713e171849efc6bd89939185be270266c94e92369e3877ad89455a",
+    "f84761459a00c6df3176ae5d94c99e69f25100d09548e5686bd0c354bb8cc60a"
+];
+
+merkle(hashes, function (err, merkleTree) {
+  console.log(merkleTree.root);
+  // ee3a2d2b895cafacff526d06a55b55e049cf84a9735e4a63f7fd08f96d0f4649 
+});
+```