Guide: Rust/Anchor basics for Solana developers

[PetarStoev02]

Description

A beginner-friendly Anchor/Rust guide in guides/solana/anchor-basics.md.

Covers: program structure, accounts, instructions, PDAs in practice, testing. Written for developers who know TypeScript but not Rust.

Deferred from Phase 2

Labels: enhancement, documentation, good first issue

[peter941221]

I'd like to work on this.

[github-actions]

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