Initial commit

Lays out directory structure start specifing core interfaces.

interfaces/IPairFunctions.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity ^0.8.13;
+
+interface IPairFunctions {
+    function price() external returns (uint256);
+}