add custom resolver contract

data_entry/EAS/Common.sol

@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+// A representation of an empty/uninitialized UID.
+bytes32 constant EMPTY_UID = 0;
+
+// A zero expiration represents an non-expiring attestation.
+uint64 constant NO_EXPIRATION_TIME = 0;
+
+error AccessDenied();
+error DeadlineExpired();
+error InvalidEAS();
+error InvalidLength();
+error InvalidSignature();
+error NotFound();
+
+/// @notice A struct representing ECDSA signature data.
+struct Signature {
+    uint8 v; // The recovery ID.
+    bytes32 r; // The x-coordinate of the nonce R.
+    bytes32 s; // The signature data.
+}
+
+/// @notice A struct representing a single attestation.
+struct Attestation {
+    bytes32 uid; // A unique identifier of the attestation.
+    bytes32 schema; // The unique identifier of the schema.
+    uint64 time; // The time when the attestation was created (Unix timestamp).
+    uint64 expirationTime; // The time when the attestation expires (Unix timestamp).
+    uint64 revocationTime; // The time when the attestation was revoked (Unix timestamp).
+    bytes32 refUID; // The UID of the related attestation.
+    address recipient; // The recipient of the attestation.
+    address attester; // The attester/sender of the attestation.
+    bool revocable; // Whether the attestation is revocable.
+    bytes data; // Custom attestation data.
+}
+
+/// @notice A helper function to work with unchecked iterators in loops.
+function uncheckedInc(uint256 i) pure returns (uint256 j) {
+    unchecked {
+        j = i + 1;
+    }
+}