feat: add p2p-safe-swap Next.js app

[diegoTech14]

📝 Addeed p2p Next.js app

📖 Description

• This PR is to add a new directory for the p2p SafeSwap app, this includes the Frontend and Backend base to consume the Trustless Work API and integrate it with Supabase.

✅ Changes made

• Added p2p-safe-swap directory
• Added Backend directory
• Added Frontend directory
• Added Supabase integration (we need to set up it)

📜 Additional Notes

• We need to set up the Supabase integration by adding the correct credentials