docs: update README.md

Author: KageRyo

README.md

@@ -1,2 +1,33 @@
 # EasyCalc
- A easy calculator by Python.
+An easy calculator by Python.
+
+## Usage
+To use the EasyCalc calculator, follow these steps:
+
+1. Clone the repository:
+    ```bash
+    git clone https://github.com/your-username/EasyCalc.git
+    ```
+
+2. Navigate to the project directory:
+    ```bash
+    cd EasyCalc
+    ```
+
+3. Run the calculator:
+    ```bash
+    python main.py
+    ```
+
+4. Follow the on-screen instructions to perform calculations.
+
+## Features
+- Addition
+- Subtraction
+- Multiplication
+- Division
+
+Feel free to explore the code and make any improvements or modifications as needed.
+
+## License
+This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for more information.