add unity project

add SOLID examples

SOLID/Assets/Scripts/Solid/CircleAreaOfEffect.cs

@@ -0,0 +1,16 @@
+using UnityEngine;
+
+namespace DefaultNamespace.Solid
+{
+    public class CircleAreaOfEffect : AreaOfEffect
+    {
+        [SerializeField] private float _radius;
+        
+        protected override bool IsInsideOfEffectArea(Collision other)
+        {
+            // do some calculations here
+
+            return false;
+        }
+    }
+}