DOC: update README and doc

Author: Dengda98

README.md

@@ -9,6 +9,8 @@
   <img alt="GitHub License" src="https://img.shields.io/github/license/Dengda98/PyGRT">
 </p>
 
+> ⭐ **Like this project? Give it a Star!** ⭐
+
 [**中文文档**](https://pygrt.readthedocs.io/zh-cn/)
 
 # Overview

docs/source/index.rst

@@ -6,7 +6,16 @@
 
 -----------------------------------------------------------
 
-**PyGRT** Github首页： `PyGRT <https://github.com/Dengda98/PyGRT>`_
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+.. raw:: html 
+
+  <!-- Place this tag in your head or just before your close body tag. -->
+  <script async defer src="https://buttons.github.io/buttons.js"></script>
+
+  <!-- Place this tag where you want the button to render. -->
+  <a class="github-button" href="https://github.com/Dengda98/PyGRT" data-icon="octicon-star" data-size="large" aria-label="Star Dengda98/PyGRT on GitHub">Star</a>
+
+
 
 **PyGRT** : 一个用于计算在半无限水平分层均匀介质模型中的理论地震图的 **Python**\程序包，使用广义反射透射系数矩阵法(**G**\eneralized **R**\eflection-**T**\ransmission coefficient matrix) 以及离散波数法等方法计算。