Adds ERC-20 via Hardhat tutorial

[albertov19]

📝 Description

Adds deploy an ERC-20 via Hardhat following -> https://github.com/polkadot-developers/revm-hardhat-examples/tree/master/erc20-hardhat

🔍 Review Preference

Choose one:

• ✅ I have time to handle formatting/style feedback myself
• ⚡ Docs team handles formatting (check "Allow edits from maintainers")

🤖 AI-Ready Docs

If content changed, regenerate AI files:

• ✅ I ran python3 scripts/generate_llms.py
• ⚡ Docs team will regenerate (check "Allow edits from maintainers")

✅ Checklist

• Changes tested
• PaperMoon Style Guide followed

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[nhussein11]

Thanks!! Left some comments

[nhussein11]

LGTM! left one comment in one of the solved conversations, but it's a minor detail. It's ready for @polkadot-developers/docs-formatting-team :) Thanks!