Adds mice (#3594)

* Initial

* Mmm

* Adds them to map

* Makes mice grindable

* meta.json looking nice

* Mice go squeak

* Ye

* E

* Review

* Update Content.Server/GameObjects/Components/Mobs/Speech/MouseAccentComponent.cs

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>

Content.Server/GameObjects/Components/Mobs/Speech/MouseAccentComponent.cs

@@ -0,0 +1,24 @@
+using System;
+using Robust.Shared.GameObjects;
+using System.Collections.Generic;
+using Robust.Shared.Random;
+using Robust.Shared.IoC;
+
+namespace Content.Server.GameObjects.Components.Mobs.Speech
+{
+    [RegisterComponent]
+    public class MouseAccentComponent : Component, IAccentComponent
+    {
+        [Dependency] private readonly IRobustRandom _random = default!;
+        public override string Name => "MouseAccent";
+
+        private static readonly IReadOnlyList<string> Squeek = new List<string>{
+            "Squeak!", "Piep!", "Chuu!"
+        }.AsReadOnly();
+
+        public string Accentuate(string message)
+        {
+            return _random.Pick(Squeek);
+        }
+    }
+}