Add URL for DigiCert Global Root G2 certificate

Fixes GitHub Pages on iOS 7.0.x and below

repo/index.html

@@ -5,5 +5,7 @@ <h1>bigfloppa234's repo</h1>
 		<a href="cydia://url/https://cydia.saurik.com/api/share#?source=https://bigfloppa234.github.io/repo">Add to Cydia</a>
 		<a href="sileo://source/https://bigfloppa234.github.io/repo">Add to Sileo</a>
 		<a href="zbra://sources/add/https://bigfloppa234.github.io/repo">Add to Zebra</a>
+		<p>If you have trouble adding this repo to your package manager on a device on iOS 7.0.x or below, add the DigiCert Global Root G2 cert.</p>
+		<p>You can add it by visiting this URL on your device: https://cacerts.digicert.com/DigiCertGlobalRootG2.crt.pem</p>
 	</body>
 </html>