Add "echo" command (#5331)

Co-authored-by: T <tomeno@lulzsec.co.uk>

Content.Server/Utility/Commands/EchoCommand.cs

@@ -0,0 +1,23 @@
+using Content.Server.Administration;
+using Robust.Shared.Console;
+using Robust.Shared.Localization;
+
+namespace Content.Server.Utility.Commands
+{
+    [AnyCommand]
+    class EchoCommand : IConsoleCommand
+    {
+        public string Command => "echo";
+
+        public string Description => Loc.GetString("echo-command-description");
+
+        public string Help => Loc.GetString("echo-command-help-text", ("command", Command));
+
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            if (argStr.Length > Command.Length)
+                shell.WriteLine(argStr.Substring(Command.Length+1));
+            return;
+        }
+    }
+}