added asciinema for gendiff console app

Author: Alexsey-VR

README.md

@@ -1,2 +1,8 @@
+### FILE DIFFERENCE CALCULATOR
+
 ### Hexlet tests and linter status:
-[![Actions Status](https://github.com/Alexsey-VR/php-project-48/actions/workflows/hexlet-check.yml/badge.svg)](https://github.com/Alexsey-VR/php-project-48/actions)
+[![Actions Status](https://github.com/Alexsey-VR/php-project-48/actions/workflows/hexlet-check.yml/badge.svg)](https://github.com/Alexsey-VR/php-project-48/actions)
+
+### List of functions:
+* [gendiff(string file1, string file2)](https://github.com/Alexsey-VR/php-project-48/blob/main/docs/gendiff.gif)
+