feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

docs/sdk/src/reference_docs/state.rs

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+//! # State
+//!
+//! The state is abstracted as a key-value like database. Every item that
+//! needs to be persisted by the [State Transition
+//! Function](crate::reference_docs::blockchain_state_machines) is written to the state.
+//!
+//! ## Special keys
+//!
+//! The key-value pairs in the state are represented as byte sequences. The node
+//! doesn't know how to interpret most the key-value pairs. However, there exist some
+//! special keys and its values that are known to the node, the so-called
+//! [`well-known-keys`](sp_storage::well_known_keys).