update readme

Author: kolirt

README.md

@@ -6,6 +6,11 @@
   - [Installation](#installation)
   - [Setup](#setup)
 - [Usage](#usage)
+  - [Set value](#set-value)
+  - [Get all values](#get-all-values)
+  - [Get value](#get-value)
+  - [Delete value](#delete-value)
+  - [Flush cache](#flush-cache)
 - [Console commands](#console-commands)
 - [FAQ](#faq)
 - [License](#license)