docs(alerts): add Crashlytics onNewNonfatalIssuePublished to README and examples

Author: dackers86

README.md

@@ -519,6 +519,15 @@ firebase.alerts.crashlytics.onNewFatalIssuePublished(
   },
 );
 
+// Crashlytics non-fatal issues
+firebase.alerts.crashlytics.onNewNonfatalIssuePublished(
+  (event) async {
+    final issue = event.data?.payload.issue;
+    print('Non-fatal issue: ${issue?.title}');
+    print('App: ${event.appId}');
+  },
+);
+
 // Crashlytics stability digest
 firebase.alerts.crashlytics.onStabilityDigestPublished(
   (event) async {

example/alerts/bin/server.dart

@@ -23,6 +23,15 @@ void main(List<String> args) async {
       print('  App ID: ${event.appId}');
     });
 
+    // Crashlytics new non-fatal issue alert
+    firebase.alerts.crashlytics.onNewNonfatalIssuePublished((event) async {
+      final issue = event.data?.payload.issue;
+      print('New non-fatal issue in Crashlytics:');
+      print('  Issue ID: ${issue?.id}');
+      print('  Title: ${issue?.title}');
+      print('  App ID: ${event.appId}');
+    });
+
     // Crashlytics stability digest alert
     firebase.alerts.crashlytics.onStabilityDigestPublished((event) async {
       final payload = event.data?.payload;