Updated Readme

README.md

@@ -7,4 +7,28 @@ you're reading large amounts of data it can be done piece by piece.
 
 I have tried to make it functionally equivalent to c's implementation, but it's not quite complete due to some limitations.
 
-It would be nice for this to develop into a native php extension that can be phpize'd as a post install if the environment supports it.
+It would be nice for this to develop into a native php extension that can be phpize'd as a post install if the environment supports it.
+
+## Setup
+
+Using composer:
+
+```json
+  "require": {
+  	"calcinai/php-mmap": "^0.1"
+  }
+```
+
+## Usage
+
+Via a URI (of sorts)
+```php
+    $mmap = fopen('mmap:///dev/mem:1024?offset=0', 'rw');
+```
+
+Via wrapper method
+```php
+    $mmap = mmap_open('/dev/mem', 1024, 0);
+```
+
+You can use `fseek()`, `fread()` and `fwrite()` on the stream.  If you have a use for others, let me know.