Added Dev build

Author: YashwanthRaoBN

src/components/Header/Header.jsx

@@ -221,6 +221,7 @@ const Header = ({
   return (
     <header>
       <img width="250" height="50" className="logo" alt="NRF Logo" src={NRFLogo} />
+      <span>Dev Build</span>
 
       {showFailAlert && <Alert classStyle="alert-fail" heading={alertHeading} value={alertVal} />}
       {responseSubmit && <Alert classStyle="alert-success" heading={alertHeading} value={alertVal} />}