Add writeoff wrapper for nav feed pv

src/borrower/wrappers/writeOffWrapperPV.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+pragma solidity >=0.7.6;
+pragma experimental ABIEncoderV2;
+
+import "tinlake-auth/auth.sol";
+
+interface NAVFeedPVLike {
+    function writeOff(uint256 loan) external;
+}
+
+/// @notice WriteOff contract can move overdue loans into a write off group
+/// The wrapper contract works specifically for the NAVFeedPV version
+contract WriteOffWrapperPV is Auth {
+    NAVFeedPVLike navFeed;
+
+    constructor(address navFeed_) {
+        navFeed = NAVFeedPVLike(navFeed_);
+        wards[msg.sender] = 1;
+        emit Rely(msg.sender);
+    }
+
+    /// @notice writes off an overdue loan
+    /// @param loan the id of the loan
+    function writeOff(uint256 loan) public auth {
+        navFeed.writeOff(loan)
+    }
+}