I found 2 ways to add Donate function in your github project.

• Markdown
• Button

You can get link of image file in SVG file format like this from http://shields.io/ and concatinate it with your email code in your PayPal account, please see example below:

[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](YOUR_EMAIL_CODE)

The button in Donation like Markdown topic but only change the image.

[![paypal](https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif)](YOUR_EMAIL_CODE)

Methods :

• Buy me a coffee
• Ko-fi

If this project help you reduce time to develop, you can give me a cup of coffee :)