update minimum Android version in introduction

app/src/main/res/values/strings.xml

@@ -1,6 +1,6 @@
 <resources>
     <string name="app_name">Auditor</string>
-    <string name="introduction">Two devices with Android 10 or higher are needed to perform verification:\n\n- The device to be verified (Auditee), which needs to be one of the supported devices.\n\n- An Android device to perform the verification (Auditor).\n\nThe verification process requires sending data between the devices by scanning QR codes.</string>
+    <string name="introduction">Two devices with Android 12 or higher are needed to perform verification:\n\n- The device to be verified (Auditee), which needs to be one of the supported devices.\n\n- An Android device to perform the verification (Auditor).\n\nThe verification process requires sending data between the devices by scanning QR codes.</string>
     <string name="unsupported_auditee">Device is not one of the supported models.</string>
     <string name="camera_permission_denied">Camera permission is required to scan QR codes.</string>
     <string name="auditee_button">Auditee (device being verified)</string>