add GoogleService-Info.plist into gitignore

.gitignore

@@ -7,6 +7,7 @@ xcuserdata/
 Classes/LinphoneIOSVersion.h
 Pods/
 Podfile.lock
+GoogleService-Info.plist
 build
 test-reports
 WORK

Classes/LinphoneAppDelegate.m

@@ -239,7 +239,12 @@
 #pragma deploymate pop
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
-    [FIRApp configure];
+    NSString *pathForFile=[[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"GoogleService-Info.plist"];
+    if ([[NSFileManager defaultManager] fileExistsAtPath:pathForFile]){
+        // If GoogleService-Info.plist doesn't exist, not call this function avoiding a crash.
+        [FIRApp configure];
+    }
+    
     UIApplication *app = [UIApplication sharedApplication];
 	UIApplicationState state = app.applicationState;