first commit

contracts/account.sol

@@ -0,0 +1,32 @@
+pragma solidity ^0.4.23;
+
+contract Accounts {
+
+  mapping(address => Account) accounts;
+
+  struct Account {
+    address ID;
+    int64 Balance;
+    bytes32[] History;
+  }
+
+  event BalanceUpdated(address sender, address receiver, int64 value);
+
+  function updateBalance(address _receiver, int64 _value) public {
+    // get Account of _sender
+    // check if balance of _sender is under the limit
+    // substract _value from _sender account
+    accounts[msg.sender].Balance = accounts[msg.sender].Balance - _value;
+    // add _value to _receiver account
+    accounts[_receiver].Balance = accounts[_receiver].Balance + _value;
+
+    // add transaction to history of sender and receiver accounts
+
+    // emit BalanceUpdated
+    emit BalanceUpdated(msg.sender, _receiver, _value);
+
+  }
+  function getBalance(address _address) public view returns (int64) {
+    return accounts[_address].Balance;
+  }
+}