docs: update readme

README.md

@@ -1,5 +1,18 @@
 # tellydb
-A toy database project for educational purposes.
+A toy key-value database project for educational purposes.
+
+## Features
++ Partially implemented [RESP2](https://redis.io/docs/latest/develop/reference/protocol-spec/) from redis.
++ Includes B-Tree for caching.
++ Fully configurable via [.tellyconf](./FILE.md).
++ Includes transaction/command queue system.
+
+## Usage
+Start the server, install a tool that you can connect to redis server like redis-cli. Start to use!
+
+## Quick Start
+To get information about server, use `telly help`.
+To get information about available commands, look at [src/commands](./src/commands/)
 
 ## License
 Licensed under [BSD-3 Clause Clear License](./LICENSE).