Add config for PHPStan level 1
Add config for PHPStan level 1

dstockto/joindin-web2,joindin/joindin-web2,joindin/joindin-web2,dstockto/joindin-web2,dstockto/joindin-web2,dstockto/joindin-web2,joindin/joindin-web2,joindin/joindin-web2