Added base parts

Parts/Base/Mouth.cs

@@ -0,0 +1,7 @@
+namespace WaifuCellar.Parts.Base;
+
+public class Mouth : Part {
+    public override List<IBuff> Buffs { get; set; } = new();
+    public override Part? ParentPart { get; set; }
+    public override List<Part> AttachedParts { get; set; } = new();
+}