Add DotRecast in AI & Pathfinding Section

- https://github.com/ikpil/DotRecast

DotRecast is a port of Recast & Detour, a navigation mesh toolset for games, to the C# language. It is useful for game developers who want to use C# servers, C# projects, or Unity3D for their games. DotRecast allows you to generate and use navigation meshes for pathfinding and spatial reasoning in your game world. You can also customize the navmesh generation and runtime navigation systems to suit your specific game’s needs.

Author: ikpil

README.md

@@ -71,6 +71,7 @@ Navigation:
 * [SimpleTraffic](https://github.com/Kink3d/SimpleTraffic) - a simple traffic simulation using Nav Mesh.
 * [Self-driving-vehicle](https://github.com/Habrador/Self-driving-vehicle) - Car pathfinding using Hybrid A* search algorithm.
 * [GOAP](https://github.com/crashkonijn/GOAP) - Multithreaded Goal Oriented Action Planner for Unity.
+* [DotRecast](https://github.com/ikpil/DotRecast) - a port of Recast & Detour, navigation mesh toolset for games, Unity3D, servers, C#.
 
 ## Physics
 * [Mario Galaxy Gravity for Unity](https://gist.github.com/phosphoer/a283cdbeca5d2160d5eed318d0362826) - mario galaxy gravity.