Update README.md

Author: CoderAstrid

README.md

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 # FractalQT
 Drawing of mandelbrot by QT
+
+## Contents
+
+## Versions
+
+### Ver-0.1
+
+Only concept & multi thread
+
+### Ver-0.2
+
+With Juila set
+
+### Ver 0.3
+
+Mouse event
+
+### Ver 0.4
+
+Hi-resolution
+
+### Ver 0.5
+
+With CUDA
+
+### Ver 0.6
+
+With OpenGL
+
+### Ver 0.7
+
+With QML
+
+## References
+
+<a href = 'https://en.wikipedia.org/wiki/Mandelbrot_set#:~:text=The%20Mandelbrot%20set%20(%2F%CB%88m,remains%20bounded%20in%20absolute%20value.'>Mandelbrot set</a>
+
+<a href = "https://mateuszsiedlecki.com/index.php/2020/05/27/drawing-fractals-in-qt-using-threads/">Drawing fractals in Qt using threads</a>