Add image editor to main readme

Author: AndrewRadev

README.md

@@ -72,6 +72,12 @@ A game engine that uses DirectX 11 for rendering as well as Win32 API for its ot
 - Scene system
 - Level editor
 
+### ImageEditor (2021)
+
+Source: <https://github.com/nadezhda1120/ImageEditor>
+
+https://user-images.githubusercontent.com/124255/157017477-ea3421e3-f7cc-4c7d-94c6-cf8d7263096f.mp4
+
 ### Brainfuck visualizer (2020)
 
 Source: <https://github.com/vtklisurov/RustProject>