allow scanning vicc configuration with QR code

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

@@ -47,5 +47,6 @@
     <string name="vicc_config_info">If you choose the virtual smart card (VICC) as emulator, you need to start the it on your computer with the `--reversed` flag and configure the connection parameters here accordingly.</string>
     <string name="hint_vicc_port">VICC Port</string>
     <string name="hint_vicc_hostname">VICC Hostname</string>
+    <string name="scheme_vicc">vicc</string>
 
 </resources>

ACardEmulator/app/src/main/res/xml/settings.xml

@@ -59,6 +59,12 @@
                 android:data="https://frankmorgner.github.io/vsmartcard/virtualsmartcard/README.html" />
         </Preference>
 
+        <Preference
+            android:title="Scan Configuration"
+            android:summary="Scan QR code to import VICC's hostname and port."
+            android:key="scan">
+        </Preference>
+
         <EditTextPreference
             android:key="hostname"
             android:defaultValue="10.0.2.2"