New Python Program: Simple Calculator

Hello Python enthusiasts! Let's enhance our repository with a Simple Calculator implemented in Python. This beginner-friendly task involves creating a command-line calculator that can perform basic arithmetic operations. This program will showcase fundamental input handling, arithmetic operations, and conditional statements in Python.

**Tasks:**
- Implement functions for addition, subtraction, multiplication, and division.
- Allow users to input two numbers and select an operation (+, -, *, /).
- Perform the corresponding operation and display the result to the user.
- Handle division by zero and invalid inputs gracefully.
- Provide clear instructions and error messages for the users.

**Guidelines:**
- Use Python 3.x for the program.
- Implement functions to handle each arithmetic operation separately.
- Ensure the calculator provides clear prompts and feedback to the user.
- Include comments in your code to explain the logic and functionality.
- Test the calculator with various inputs to ensure accurate calculations.

**Example:**

```
Welcome to the Simple Calculator!

Please enter the first number: 10
Please enter the second number: 5
Select operation (+, -, *, /): +

Result: 10 + 5 = 15
```

**How to Contribute:**
1. Fork this repository.
2. Create a new Python file for the Simple Calculator: `simple_calculator.py`.
3. Write the Python program following the specified tasks and guidelines.
4. Test the calculator thoroughly to ensure it functions correctly.
5. Commit your changes: `git commit -m "Add Simple Calculator program"`
6. Push to your branch: `git push origin add-simple-calculator`
7. Open a pull request to this repository.

Your contribution will provide users with a handy tool for basic calculations. Thank you for creating this useful Python program for our repository!