add ISemver.sol

contracts/ERC5018.sol

@@ -4,8 +4,9 @@ pragma solidity ^0.8.0;
 import "./IERC5018.sol";
 import "./LargeStorageManager.sol";
 import "./BlobStorageManager.sol";
+import "./ISemver.sol";
 
-contract ERC5018 is IERC5018, LargeStorageManager, BlobStorageManager {
+contract ERC5018 is LargeStorageManager, BlobStorageManager, IERC5018, ISemver {
 
     enum StorageMode {
         Uninitialized,

contracts/ISemver.sol

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+/// @title ISemver
+/// @notice ISemver is a simple contract for ensuring that contracts are
+///         versioned using semantic versioning.
+interface ISemver {
+    /// @notice Getter for the semantic version of the contract. This is not
+    ///         meant to be used onchain but instead meant to be used by offchain
+    ///         tooling.
+    /// @return Semver contract version as a string.
+    function version() external view returns (string memory);
+}