Add a note into the README.md.

README.md

@@ -1,7 +1,28 @@
-# At-RTOS · ![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)
+<p align="center">
+# At-RTOS &middot; ![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg) ![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)
+
+<a href="https://github.com/At-EC/At-RTOS/stargazers">
+    <img alt="GitHub stars" src="https://img.shields.io/github/stars/At-EC/At-RTOS?color=success">
+</a>
+<a href="https://github.com/At-EC/At-RTOS/issues">
+    <img alt="GitHub issues" src="https://img.shields.io/github/issues/At-EC/At-RTOS">
+</a>
+<a href="https://github.com/At-EC/At-RTOS/actions">
+    <img alt="Build" src="https://github.com/At-EC/At-RTOS/workflows/kernal-sample/badge.svg">
+</a>
+
+</p>
 
 At-RTOS is a fully featured embedded controller's real-time operating system designed specifically for the ARM Cortex M seiral architecture.
 
+The goal of the project is to explore and try to provide some useful interfaces based on the RTOS to support and simplify your embedded firmware development.
+
+If this project was useful to you, give it a ⭐️ and I'll keep improving it! 
+
+Or you can provide your idea or the problem that you met, We can improve it in the RTOS kernal. 
+
+## Brief Introduction
+
 * **Open source:** Royalty free.
 * **Tickless:** At-RTOS makes it painless to create battery-powered application. 
 * **Preemptive and Cooperative Scheduling:** You can easily config your task to pass preemptive and cooperative scheduling through your thread's priority setting.