feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

pezkuwi/roadmap/implementers-guide/src/runtime-api/validation-code.md

@@ -0,0 +1,21 @@
+# Validation Code
+
+Fetch the validation code used by a para, making the given `OccupiedCoreAssumption`.
+
+```rust
+fn validation_code(at: Block, ParaId, OccupiedCoreAssumption) -> Option<ValidationCode>;
+```
+
+Fetch the validation code (past, present or future) by its hash.
+
+```rust
+fn validation_code_by_hash(at: Block, ValidationCodeHash) -> Option<ValidationCode>;
+```
+
+Fetch the validation code hash used by a para, making the given `OccupiedCoreAssumption`.
+
+> ⚠️ This API was introduced in `TeyrchainHost` v2.
+
+```rust
+fn validation_code_hash(at: Block, ParaId, OccupiedCoreAssumption) -> Option<ValidationCodeHash>;
+```