Initialized all classes.

Completed Tile.cs
Completed TilePattern.cs
Completed CalcPiecesPerHour method in Company.cs

Mosaic/TilePattern.cs

@@ -5,5 +5,39 @@
 /// </summary>
 public class TilePattern
 {
-    // TODO
+    private readonly Tile[] _tiles;
+    public readonly PatternStyle Style;
+
+    public double Area
+    {
+        get
+        {
+            double area = 0;
+            foreach (var tile in _tiles)
+            {
+                area += tile.Area;
+            }
+
+            return area / 1000000;
+        }
+    }
+
+    public int Pieces => _tiles.Length;
+
+    public TilePattern(PatternStyle style, Tile[] tiles)
+    {
+        Style = style;
+        _tiles = tiles;
+    }
+    
+    public decimal CalcProductionCost()
+    {
+        decimal productionCost = 0;
+        foreach (var tile in _tiles)
+        {
+            productionCost += tile.CalcProductionCost();
+        }
+
+        return productionCost;
+    }
 }