Update doc

Author: jcs090218

README.md

@@ -1,6 +1,22 @@
-[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://opensource.org/licenses/MIT)
+[![License: CC BY-NC-ND 4.0](https://img.shields.io/badge/License-CC_BY--NC--ND_4.0-lightgrey.svg)](https://creativecommons.org/licenses/by-nc-nd/4.0/)
 
 # jcs-emacs.github.io
 Landing page for jcs-emacs
 
 [![Build Website](https://github.com/jcs-emacs/jcs-emacs.github.io/actions/workflows/build.yml/badge.svg)](https://github.com/jcs-emacs/jcs-emacs.github.io/actions/workflows/build.yml)
+
+## Contribute
+
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](http://makeapullrequest.com)
+[![Donate on paypal](https://img.shields.io/badge/paypal-donate-1?logo=paypal&color=blue)](https://www.paypal.me/jcs090218)
+
+If you would like to contribute to this project, you may either clone and make pull
+requests to this repository. Or you can clone the project and establish your own
+branch of this tool. Any methods are welcome!
+
+## ?? License
+
+This work is licensed under the [CC BY-ND 4.0](https://creativecommons.org/licenses/by-nd/4.0/) license.
+
+[![](https://i.creativecommons.org/l/by-nc-nd/4.0/88x31.png)](https://creativecommons.org/licenses/by-nd/4.0/)
+[![License: CC BY-NC-ND 4.0](https://licensebuttons.net/l/by-nc-nd/4.0/80x15.png)](https://creativecommons.org/licenses/by-nc-nd/4.0/)