created a png file of icon and added to html

Author: ivedmohan

Projects/Calculator/img/icon.png

@@ -12,7 +12,7 @@
     <section>
         <header>
             <nav>
-                <img src="https://as2.ftcdn.net/v2/jpg/01/29/23/31/1000_F_129233141_VEb6yy0GHZFxnwXSSNpaD2TYnaLfhd43.jpg" alt="This is logo" class="img_logo">
+                <img src="./img/icon.png" alt="This is logo" class="img_logo">
                 <span class="header_title">
                     Calculator
                 </span>