add title zoom

app/pub/scripts/anviewer.js

@@ -29,21 +29,22 @@ function renderPage() {
         }
       });
     });
-
+    
+    document.getElementById('zoompdf').innerHTML = scale + 'x';
     document.getElementById('pdfprogress').innerHTML = 'Приятного чтения ↓';
 }  
 
 
 function pdfzoomin(){
 
-    scale += 0.5;
+    scale += 0.25;
     renderPage();
 
 }
 
 function pdfzoomout(){
 
-    scale -= 0.5;
+    scale -= 0.25;
     renderPage();
 
 }