fix: complete WaterBlock IBlock implementation and BlockIds list

World/Blocks/BlockIds.txt

@@ -0,0 +1,7 @@
+Air = 0
+Stone = 1
+Dirt = 2
+Grass = 3
+Sand = 4
+Snow = 5
+Water = 6

World/Blocks/WaterBlock.cs

@@ -1,6 +1,10 @@
 namespace VoxelEngine.World.Blocks;
 
-public class WaterBlock
+public class WaterBlock : IBlock
 {
-    
+    public ushort Id => 6;
+    public string Name => "Water";
+    public bool IsOpaque => true;
+    public bool IsSolid => false;
+    public TileCoord GetTextureTile(BlockFace face) => new(3, 3);
 }