Add startuptime and update creationDate

src/Managing.Domain/Bots/IBot.cs

@@ -18,6 +18,11 @@ namespace Managing.Domain.Bots
         /// <returns>TimeSpan representing the runtime, or TimeSpan.Zero if the bot is not running</returns>
         TimeSpan GetRuntime();
 
+        /// <summary>
+        /// The time when the bot was first started (creation date)
+        /// </summary>
+        DateTime StartupTime { get; }
+
         string Identifier { get; set; }
         void SaveBackup();
         void LoadBackup(BotBackup backup);