feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

docs/sdk/src/reference_docs/fee_less_runtime.rs

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+//! # Fee-Less Runtime
+//!
+//! 🚧 Work In Progress 🚧
+//!
+//! Notes:
+//!
+//! - An extension of [`runtime_vs_smart_contract`], showcasing the tools needed to build a safe
+//!   runtime that is fee-less.
+//! - Would need to use unsigned origins, custom validate_unsigned, check the existence of some NFT
+//!   and some kind of rate limiting (eg. any account gets 5 free tx per day).
+//! - The rule of thumb is that as long as the unsigned validate does one storage read, similar to
+//!   nonce, it is fine.
+//! - This could possibly be a good guide/template, rather than a reference doc.