add Button dom elements

game/index.js

@@ -6,6 +6,9 @@ let computerScore = 0;
 const playerScoreElement = document.getElementById("player-score")
 const computerScoreElement = document.getElementById("computer-score")
 const roundResultsMessage = document.getElementById("results-msg")
+const buttonStein = document.getElementById("rock-btn")
+const buttonPapier = document.getElementById("paper-btn")
+const buttonSchere = document.getElementById("scissors-btn")
 
 function getRandomComputerResult(){
     const number = Math.floor(Math.random()*options.length);