Add a badge for Doxygen in README

Author: zhi-wang

.github/workflows/push_branch_master.yaml .github/workflows/doxygen_gh_pages.yaml.github/workflows/push_branch_master.yaml renamed to .github/workflows/doxygen_gh_pages.yaml

@@ -1,4 +1,4 @@
-name: on_push_to_branch_master
+name: Doxygen
 on:
    push:
       branches:

README.md

@@ -2,6 +2,7 @@ Tinker9: Next Generation of Tinker with GPU Support
 ===================================================
 [//]: # (Badges)
 [![Docs Status](https://readthedocs.org/projects/tinker9-manual/badge/?version=latest&style=flat)](https://tinker9-manual.readthedocs.io)
+[![Doxygen Page Status](https://github.com/tinkertools/tinker9/actions/workflows/doxygen_gh_pages.yaml/badge.svg?branch=master)](https://tinkertools.github.io/tinker9/)
 
 
 <h2>Introduction</h2>