Add beginner-friendly PyCardano example scripts

[stnltd]

I'm participating in the Cardano Builderthon and noticed PyCardano lacks beginner-friendly, heavily-commented examples for developers new to Cardano.

I'd like to contribute a set of tutorial scripts covering common use cases:

Proposed Examples:

1. wallet_balance_checker.py - Check wallet balance using Blockfrost
2. simple_ada_transfer.py - Send ADA from one address to another
3. query_transaction.py - Look up transaction details by hash
4. utxo_explorer.py - List and analyze UTXOs for an address

What makes these different:

• ✅ Line-by-line explanatory comments
• ✅ Comprehensive error handling
• ✅ Setup instructions included
• ✅ Expected output examples
• ✅ Common mistakes documented
• ✅ Works on testnet (safe for learning)

Target Audience:

Python developers new to Cardano who understand basic blockchain concepts but need practical examples.

Deliverables:

• /examples/beginner/ folder with 4 scripts
• README.md with setup guide
• Each script fully tested on preprod testnet

Can I proceed with this contribution?

Related to: Cardano Builderthon 2024