docs: add mascot description

1. add mascot nine-color-deer description

Change-Id: I492483c3b1223551c42907028d7e0b74bc5441ad

README-zh_CN.md

@@ -2,7 +2,11 @@
 
 [English](./README.md) | 简体中文
 
-Skyline 是一个经过 UI 和 UE 优化过的 OpenStack 仪表盘, 拥有现代化的技术栈和生态，更易于开发者维护和使用者操作, 以及更高的并发性能.
+Skyline 是一个经过 UI 和 UE 优化过的 OpenStack 仪表盘，拥有现代化的技术栈和生态，更易于开发者维护和使用者操作，以及更高的并发性能。
+
+Skyline 的吉祥物是九色鹿。九色鹿源自于敦煌壁画《九色鹿本生》，其寓意是佛理因果和知恩图报，这与九州云自创办以来秉持的拥抱和反馈社区理念一致。我们也希望 Skyline 像九色鹿一样，轻巧、优雅，而又能力强大，为 OpenStack 社区和用户提供更优质的 Dashboard。
+
+![](docs/images/nine-color-deer-64.png)
 
 **目录**
 

README.md

@@ -4,6 +4,10 @@ English | [简体中文](./README-zh_CN.md)
 
 Skyline is an OpenStack dashboard optimized by UI and UE. It has a modern technology stack and ecology, is easier for developers to maintain and operate by users, and has higher concurrency performance.
 
+Skyline's mascot is the nine-color deer. The nine-color deer comes from Dunhuang mural "the nine-color king deer", whose moral is Buddhist cause-effect and gratefulness, which is consistent with 99cloud's philosophy of embracing and feedback community since its inception. We also hope Skyline can keep light, elegant and powerful as the nine-color deer, to provide a better dashboard for the openstack community and users.
+
+![](docs/images/nine-color-deer-64.png)
+
 **Table of contents**
 
 - [Resources](#resources)