maint: renamed player folder to units to match namespaces. added unit class as well.

Assets/Scripts/Units/IKillable.cs

@@ -0,0 +1,10 @@
+using Reset.Core;
+
+namespace Reset.Units{
+    public interface IKillable : IDamageable{
+        public void Kill();
+
+        public float maxHealth{ get; set; }
+        public float currentHealth{ get; set; }
+    }
+}