feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

substrate/client/offchain/README.md

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+Substrate offchain workers.
+
+The offchain workers is a special function of the runtime that
+gets executed after block is imported. During execution
+it's able to asynchronously submit extrinsics that will either
+be propagated to other nodes or added to the next block
+produced by the node as unsigned transactions.
+
+Offchain workers can be used for computation-heavy tasks
+that are not feasible for execution during regular block processing.
+It can either be tasks that no consensus is required for,
+or some form of consensus over the data can be built on-chain
+for instance via:
+1. Challenge period for incorrect computations
+2. Majority voting for results
+3. etc
+
+License: GPL-3.0-or-later WITH Classpath-exception-2.0