HelloWorld Solidity contract for ZKUni

HelloWorld.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;
contract HelloWorld {
    uint256 number;

    /**
     * @param _number value to store
     */
    function storeNumber(uint256 _number) public {
        number = _number;
    }

    /**
     * @return value of 'number'
     */
    function retrieveNumber() public view returns (uint256){
        return number;
    }
}