Minor formatting of README.md

Author: MelvMay-Unity

LowLevel/Sandbox/LICENSE.md

@@ -4,10 +4,11 @@ Licensed under the Unity Companion License for Unity-dependent projects--see [Un
 
 Unless expressly provided otherwise, the Software under this license is made available strictly on an “AS IS” BASIS WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. Please review the license for details on these and other terms and conditions.
 
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+---
 
 Acknowledgement and thanks is made to Erin Catto, the creator of Box2D v3, from which significant portions of this "Sandbox" project is based upon.
 
-Box2D: https://github.com/erincatto/box2d 
-License: https://github.com/erincatto/box2d/blob/main/LICENSE
+[Box2D](https://github.com/erincatto/box2d)
+[License](https://github.com/erincatto/box2d/blob/main/LICENSE)
 
+---