Add basic readme

Author: mattphillips

README.md

@@ -0,0 +1,50 @@
+# Deep Object Diff
+
+A small library that will deep diff two JavaScript Objects, including nested structures of arrays and objects, and return the difference.
+
+### Useage:
+```js
+const lhs = {
+  foo: {
+    bar: {
+      a: [1, 2],
+      b: 2,
+      c: ['x', 'y'],
+      e: 100 // deleted
+    }
+  },
+  buzz: 'world'
+};
+
+const rhs = {
+  foo: {
+    bar: {
+      a: [1], // updated (value deleted)
+      b: 2, // unchanged
+      c: ['x', 'y', 'z'], // updated (value added)
+      d: 'Hello, world!' // added
+    }
+  },
+  buzz: 'fizz' // updated
+};
+
+console.log(diff(lhs, rhs));
+
+/* logs:
+{
+  foo: {
+    bar: {
+      a: {
+        '1': undefined
+      },
+      c: {
+        '2': 'z'
+      },
+      d: 'Hello, world!',
+      e: undefined
+    }
+  },
+  buzz: 'fizz'
+}
+*/
+```