Update README.md

Author: reshmaharidhas

README.md

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 # BMI-Calculator-python
 Python desktop application to calculate Body Mass Index (BMI) using Tkinter
+
+Built using Tkinter
+
+### Programming language
+- Python
+
+### Development Tools
+- PyCharm
+
+### Bugs and Feedback
+For bugs, questions and discussions, please use the <a href="https://github.com/reshmaharidhas/BMI-Calculator-python/issues">GitHub issues</a>
+
+## Screenshots