Updated readme

README.md

@@ -1,2 +1,61 @@
 # node-tf2-sku
+
 Format items as strings or objects
+
+## What is an SKU
+
+SKU is the abbreviation of stock keeping unit. These SKUs makes it possible to represent items as readable strings, and convert them to and from objects.
+
+The SKU can safely be used to identify items, since they contain all information about them.
+
+## Examples
+
+```js
+const SKU = require('tf2-sku');
+
+// SKU of a Mann Co. Supply Crate Key - 5021 is the defindex, 6 is the quality
+const sku = '5021;6';
+
+// Converts the sku string into an item object
+const item = SKU.fromString(sku);
+/* ->
+{
+    defindex: 5021,
+    quality: 6,
+    craftable: true,
+    killstreak: 0,
+    australium: false,
+    festive: false,
+    effect: null,
+    paintkit: null,
+    wear: null,
+    quality2: null,
+    target: null,
+    craftnumber: null
+}
+*/
+```
+
+```js
+const SKU = require('tf2-sku');
+
+// Mann Co. Supply Crate Key
+const item = {
+    defindex: 5021,
+    quality: 6,
+    craftable: true,
+    killstreak: 0,
+    australium: false,
+    festive: false,
+    effect: null,
+    paintkit: null,
+    wear: null,
+    quality2: null,
+    target: null,
+    craftnumber: null
+};
+
+// Converts the item object into an sku string
+const sku = SKU.fromObject(item);
+// -> '5021;6'
+```