Document Fan Control Component for Pi4Micronaut

[yrlmanoharreddy]

Create documentation for the fan control functionality, following the established structure for existing components. This will include a component description, YAML configuration, circuit setup, and usage instructions.

**Developer Notes : **

1. Component Description:
   Describe the fan control features (start, stop, speed control).
2. YAML Configuration:
   Provide the GPIO pin configuration for fan control with an example YAML file.
3. Circuit Setup Image:
   Create a detailed image of the fan's circuit setup using a breadboard and Raspberry Pi.
4. Schematic Diagram:
   Include a clear schematic diagram of the fan control circuit.
5. Usage Instructions:
   • Write instructions for starting, stopping, and setting the fan speed.
   • Include steps for testing with Micronaut and Pi4J.

Acceptance Criteria:

• Component Description - what it can do
• Add yaml configuration
• Circuit setup image
• Schematic diagram
• Instructions on how to use