feat/ Add Python implementation of counter contract

[fati-Onchain]

Python Implementation of NEAR Counter Smart Contract

Adds a Python implementation of the NEAR counter contract to complement existing Rust and TypeScript versions.

What's Added

Smart Contract (contract.py)

• initialize() - Initialize contract state
• get_num() - Get current counter value
• increment(number) - Increment counter (default: 1)
• decrement(number) - Decrement counter (default: 1)
• reset() - Reset counter to zero

Tests (tests/test_mod.py)

• Comprehensive test suite using near-pytest
• Covers all operations and edge cases

Documentation (README.md)

• Installation and setup instructions
• Deployment and testing guidelines