Update README with simple usage example

README.md

@@ -1,10 +1,6 @@
 # Banker
 
-A Caching library implementing the PSR-6 interface for several common cache 
-backends
-
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+A Caching library implementing the PSR-6 and PSR-16 interfaces for several common cache backends
 
 ## Cache Backends
 * Apcu
@@ -12,7 +8,23 @@ backends
 * Redis
 * Null - no persistence
 
-### Basic Usage
+### Basic Usage (SimpleCache/PSR-16)
+
+```php
+<?php
+// $config is the configuration array
+// $logger is an optional psr/log compatible logger
+$cache = new Aviat\Banker\Teller($config, $logger);
+
+// Get a value from the cache, returning $defaultValue
+// if the value doesn't exist in the cache
+$value = $cache->get($key, $defaultValue);
+
+// Save a new value at the specified key
+$saved = $cache->set($key, 'newValue');
+```
+
+### Basic Usage (Pool/PSR-6)
 ```php
 <?php
 // Create the pool