feat(JS): create clearHistoryBtn element

Author: josueJURE

index.html

@@ -35,8 +35,8 @@
             <div data-value=")" data-operator  class="child operator">)</div>
         </div>
         <ul class="computation-history">
+            <button class="clear-history-btn">clear history</button>
 
-
         </ul>
 
 

index.js

@@ -4,6 +4,8 @@ let screen = document.querySelector("[data-screen]");
 const historyBtn = document.querySelector(".history-btn");
 const slidingPart = document.querySelector(".sliding-part");
 const operators = document.querySelectorAll("[data-operator]");
+const clearHistoryBtn = document.querySelector(".clear-history-btn");
+
 
 
 const operatorRegex = /[\/*\-+]/;