Update README.md

Author: junichi11

README.md

@@ -190,6 +190,10 @@ If development version exists, it will be available in the same archive as stabl
 
 [github releases](https://github.com/junichi11/netbeans-wordpress-plugin/releases)
 
+## Donation
+
+<a href="https://www.patreon.com/junichi11"><img src="https://c5.patreon.com/external/logo/become_a_patron_button@2x.png" height="50"></a>
+
 ## License
 
 [Common Development and Distribution License (CDDL) v1.0 and GNU General Public License (GPL) v2](http://netbeans.org/cddl-gplv2.html)