Issue 16: Basic Usage Example

[adithya1012]

Description:
Create Python equivalent of examples/basic-usage.js demonstrating simple file upload.

Acceptance Criteria:

• Create examples/basic_usage.py
• Show client initialization
• Demonstrate file upload
• Show server setup
• Add inline comments
• Runnable standalone script
• No encryption for simplicity
• Add README in examples folder

Example Content:

# examples/basic_usage.py
from indexedcp import IndexedCPClient, IndexedCPServer

# Simple client-server file upload demo