Update README.md

Author: novaTopFlex

README.md

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 # PythonGUITests
 Python scripts of varied complexity for relatively simple demonstrations of the Tkinter module in Python
+## Missing Demonstrations
+Depending on the specific situation, the code may become excessively long and difficult to interpret. In these cases, I may not provide demonstrations, such as for browsing between available colors in the Tkinter interface. These are often the same color names as X11 colors, except that additional shades may be provided that are not directly descended from X11 but are shades of the X11.