before remove validation board

PathFinding/IPlanarCollection.cs

@@ -0,0 +1,7 @@
+namespace PathFinding
+{
+  interface IPlanarCollection<T>
+  {
+    T this[int x, int y] { get; set; }
+  }
+}

PathFinding/PathFinder2D.cs

@@ -0,0 +1,10 @@
+
+namespace PathFinding
+{
+  public class PathFinder2D
+  {
+    public PathFinder2D()
+    {
+    }
+  }
+}

PathFinding/PathFinding.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>