update readme

README.md

@@ -1,2 +1,58 @@
 # cache-php
 Cache tools for PHP applications
+
+### Memory
+
+Extends [PHP memcached](https://www.php.net/manual/en/book.memcached.php)
+
+#### Init
+
+```
+$memory = new Yggverse\Cache\Memory(
+
+  'localhost, // memcached server host, localhost by default
+  11211,      // memcached server port, 11211 by default
+
+  'my_app',   // application namespace
+  3600        // cache time offset by default
+);
+```
+
+#### Supported methods
+
+##### Memory::set
+
+##### Memory::delete
+
+##### Memory::flush
+
+##### Memory::get
+
+##### Memory::getByValueCallback
+
+Return cached or cache new value of plain value callback
+
+```
+  $value = $memory->getByValueCallback(
+    'key_name', // string, unique key name
+    'value',    // mixed, plain value
+    3600,       // optional, cache timeout offset for this value
+  );
+```
+
+##### Memory::getByMethodCallback
+
+Return cached or cache new value of object method callback
+
+```
+  $value = $memory->getByMethodCallback(
+    $class_object,         // object of method class
+    'method_name',         // object method name
+    [
+      $method_attribute_1, // optional, array of attributes callback method requires
+      $method_attribute_2,
+      ...
+    ]
+    3600,                  // optional, cache timeout offset for this value
+  );
+```