feat(account): Kleros abstraction

contracts/interfaces/ICoreKleros.sol

@@ -0,0 +1,25 @@
+/**
+ *  @authors: [@shotaronowhere]
+ *  @reviewers: []
+ *  @auditors: []
+ */
+
+pragma solidity ^0.8.0;
+
+/**
+ *  @title ISortitionStrategy
+ *  @author ShotaroNowhere - <[email protected]>
+ *  @dev Strategy Interface for drawing.
+ */
+interface ICore{
+
+    struct Account {
+        uint88 stakedTokens; // The account's total amount of tokens staked in subpools.
+        uint88 lockedTokens; // The account's total amount of tokens locked.
+        uint48 index; // indexing the account
+        uint32 time; // The time when the juror staked
+    }
+
+    function indexToStakeID(uint48) external view returns (bytes32);
+    function getStakeIDToAccounts(bytes32) external view returns (Account memory);
+}