Projektdateien hinzufügen.

TicTacToe/Grid.cs

@@ -0,0 +1,26 @@
+namespace TicTacToe {
+    public class Grid {
+        private readonly Player[,] _field;
+        private const int GRIDSIZE = 3;
+        public bool GameOver => IsGameOver();
+
+        private bool IsGameOver() {
+            for (var x = 0; x < GRIDSIZE; x++)
+                for (var y = 0; y < GRIDSIZE; y++)
+                    if (IsFieldEmpty(x, y))
+                        return false;
+            return true;
+        }
+
+        private bool IsFieldEmpty(int x, int y) {
+            return _field[x, y] == Player.Empty;
+        }
+
+        public Grid() {
+            _field = new Player[GRIDSIZE, GRIDSIZE];
+        }
+
+        public bool PickSpot() {
+        }
+    }
+}

TicTacToe/Player.cs

@@ -0,0 +1,7 @@
+namespace TicTacToe {
+    enum Player {
+        Empty = 0,
+        Cross = 1,
+        Circle = 2
+    }
+}

TicTacToe/TicTacToe.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>