add Computer Choice

game/index.js

 const options = ["Stein", "Papier", "Schere"];
 
 function getRandomComputerResult(){
-    console.log(Math.random());
+    const number = Math.floor(Math.random()*options.length);
+    return options[number];
 }
-getRandomComputerResult();
\ No newline at end of file
+
+console.log(getRandomComputerResult());
\ No newline at end of file