Add steam message

lib/widgets/components/stream_element_card.dart

@@ -0,0 +1,44 @@
+import 'package:desktopapp/classes/stream_element.dart';
+import 'package:flutter/material.dart';
+
+class StreamElementCard extends StatelessWidget {
+  StreamElementCard({Key? key, required this.streamElement}) : super(key: key);
+
+  final StreamElement streamElement;
+
+  @override
+  Widget build(BuildContext context) {
+    IconData icon;
+    switch (streamElement.type) {
+      case StreamElementType.log:
+        icon = Icons.info;
+        break;
+      case StreamElementType.alert:
+        icon = Icons.notifications_active;
+        break;
+    }
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Icon(
+                  icon,
+                  size: 30,
+                ),
+                SizedBox(width: 8),
+                Text(
+                  streamElement.message,
+                  style: TextStyle(fontSize: 16),
+                ),
+              ],
+            )
+          ],
+        ),
+      ),
+    );
+  }
+}