Add README File

Signed-off-by: Shivam Kumar <[email protected]>

README.md

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+# Odin Calculator
+
+This is a simple Calculator project I made while doing TheOdinProject Foundations Course.
+
+It contains basic functionality - Addition, Subtraction, Multiplication and Division.
+It also support float numbers.
+
+It calculates results simply from left to right without any operator precedence.
+
+It has proper parsing and validations to prevent invalid inputs.
+
+It supports taking input both from the given buttons as well as from keyboard, so use the one you prefer :)
+
+Calculator body is responsive and should look fine on most devices. It is tested on various mobiles, tablets and desktops resolutions using Chrome Dev Tools.
+
+Colors have proper contrast according to their backgrounds as suggested by Chrome Dev Tools.
+
+It has two parts in screen, top row which shows live result in small font, and main input row which shows input and result when pressed equal.
+
+## Demo
+
+https://shivamkumar2002.github.io/calculator-odin/
+## Screenshots
+
+![Screenshot](screenshot.png)
+
+
+## Features
+
+- Addition, Subtraction, Multiplication, Division Support
+- Simple and Intuitive UI
+- Subtle Animation on Button Press
+- Input by Button as well as Keyboard
+- Floating Numbers Support
+- Proper Input Handling
+- Show Live Result
+- Responsive Layout
+- Proper Color Contrast
+
+
+## 🛠 Skills Used
+
+HTML, CSS, JavaScript, DOM Manipulation, JavaScript Events
+
+
+## Authors
+
+- [@ShivamKumar2002](https://www.github.com/ShivamKumar2002)
+- [@RaghavKumar09](https://www.github.com/RaghavKumar09)
+
+## License
+
+[MIT](https://choosealicense.com/licenses/mit/)
+
+
+## Contributing
+
+Contributions are always welcome! Open a pull request or issue :)
+