Added readme.md file for Coffee Machine Game in python

Author: preetimahto17

Coffee-Machine-py-game/readme.md

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+# Coffee Machine
+
+This is a Python program that simulates a coffee machine. It allows you to choose from three types of coffee: espresso, latte, and cappuccino. You can check the availability of resources (water, milk, coffee beans, and cups) and buy a coffee by inserting the required amount of coins.
+
+## Prerequisites
+
+- Python 3.x
+
+## Usage
+
+1. Clone the repository or download the `coffee_machine.py` file.
+2. Open a terminal or command prompt and navigate to the directory where the file is located.
+3. Run the following command to start the program:
+
+   ```shell
+   python coffee_machine.py
+4. Follow the prompts to choose your desired coffee and enter the number of coins for payment.
+5. Enjoy your coffee!