added info text for choosing the right image

src/App.css

@@ -32,6 +32,11 @@ h2{
     font-size: calc(10px + 4vmin);
 }
 
+p{
+    max-width: 100%;
+    width: calc(40vh + 15vw);
+}
+
 .HeaderImage{
     height: calc(10px + 30vmin);
     max-width: 100%;

src/App.js

@@ -61,6 +61,7 @@ return (
         <img src={HeaderImage} className="HeaderImage" alt="Volt Logo" />
 
         <h2>Choose your Photo:</h2>
+        <p>It should best be a square image or your face in the middle. The photo is not saved and never leaves your computer.</p>
 
         <label className="labelButton" tabIndex="0" style={{outline:'none'}}>
             {!!photo ? <img src={photo} alt="Preview" /> : null}