Update README.md

Author: SValentyn

README.md

@@ -1,4 +1,8 @@
 # 2-3-tree
 
-Description project: structure and processing of 2-3-tree. Also presented is my term paper on this topic (in Ukrainian).
-I hope my project will help you! Communication with me: https://t.me/vlnt_snk
+ [![GPLv3 license](https://img.shields.io/badge/License-GPLv3-blue.svg)](http://perso.crans.org/besson/LICENSE.html)
+ [![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)](https://GitHub.com/Naereen/StrapDown.js/graphs/commit-activity)
+ 
+Description project: structure and processing of [2-3 tree](https://en.wikipedia.org/wiki/2–3_tree). Comments in the program in Russian (will change later). Also presented is my term paper on this topic (but in Ukrainian). 
+
+I hope my project will help you! Communication with me: https://t.me/vlnt_snk