update README.md

Author: aishwaryachand

Calendar GUI/README.md

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+# Calendar GUI
+
+Using this code you will be able to create a Calendar GUI where calendar of a specific year apears .The year is specified by the user.
+
+## Dependencies
+You will use `Tkinter` and `calendar` python module .
+
+## Sample Output 
+On running `Calendar_gui.py`.
+
+[![Input-Calendar.png](https://i.postimg.cc/XvWkzGgK/Input-Calendar.png)](https://postimg.cc/rDh4dp3z)
+
+
+[![Calendar-for-the-year.png](https://i.postimg.cc/5yDwq60C/Calendar-for-the-year.png)](https://postimg.cc/LgBYm4j9)
+
+
+## Author
+[Aishwarya Chand](https://github.com/aishwaryachand)
+