Create README.md

README.md

+tinyDOM
+=======
+
+tinyDOM is a fairly simple jquery alternative that works in a similar way, making it easy to find and modify DOM elements.
+It's accessed through the symbol 'μ' or the alias 'mu' where unicode isn't available (both can be used any time).
+
+Basic Usage
+-----------
+There are two different categories of tinyDOM functions - utility functions and DOM manipulation functions. The former are 
+invoked directly on the mu object and generally work on their paramaters, such as the 'merge' function for merging two JSON 
+objects:
+
+```javascript
+μ.merge(objectA, objectB); // objectA will contain all of the properties of both objectA and objectB
+```
+
+and the 'exists' function for simplifying existence checks:
+
+```javascript
+μ.exists(objectC);  // Returns false if objectC is null or if typeof(objectC) returns 'undefined'
+```
+
+DOM manipulation
+----------------
+The second category of tinyDOM functions operate on DOM elements via a mu object, which is created by passing a query selector
+to mu. The returned mu object provides methods that make it easier to interact with the DOM elements and also allows you to
+call a function on a set of DOM elements via the '.each(fn)' interface. Here's a simple example of attaching an event handler
+to all elements with the 'clickable' class:
+
+```javascript
+μ('.clickable').on('click', function(){
+  console.log(this);
+});
+```
+
+It doesn't make sense to perform certain operations on a group, and in those cases the first matched element will be used 
+as the target of a given function - this might be important in cases where multiple elements will match a query selector.
+For example, the '.data(key)' function wouldn't work if it attempted to get data from every element in a set.