create readme.md

Author: sagnik-p

GUI-Stopwatch/readme.md

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+# GUI CALCULATOR
+
+This script user Tkinter to provide a Graphical User Interface.
+
+No Requirements because Tkinter and time is inbuilt
+
+These are customizable
+
+1. The refresh rate (how fast the display updates)
+2. Colours: background,button colour
+3. Text: font, size, colour
+4. The size of the GUI window can be adjusted during execution
+5. The default size of the GUI window can be adjusted in the script
+6. The button text, position, size