Create first server message for conversations

src/data/new_conversation_message.rs

@@ -12,5 +12,18 @@ pub struct NewConversationMessage {
     pub conv_id: ConvID,
     pub message: Option<String>,
     pub file: Option<ConversationMessageFile>,
-    pub server_message: Option<ConversationServerMessageType>
+    pub server_message: Option<ConversationServerMessageType>,
+}
+
+impl NewConversationMessage {
+    /// Create a new server message
+    pub fn new_server_message(conv_id: ConvID, message: ConversationServerMessageType) -> Self {
+        Self {
+            user_id: None,
+            conv_id,
+            message: None,
+            file: None,
+            server_message: Some(message),
+        }
+    }
 }