Adds FlammableComponent, humans can now catch on fire. (#2115)

Content.Shared/GameObjects/Components/Atmos/SharedFlammableComponent.cs

@@ -0,0 +1,18 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Atmos
+{
+    public class SharedFlammableComponent : Component
+    {
+        public override string Name => "Flammable";
+    }
+
+    [Serializable, NetSerializable]
+    public enum FireVisuals
+    {
+        OnFire,
+        FireStacks,
+    }
+}