Reorganize shaders into a group

MetaballsKit/Shaders/ShaderTypes.hh

@@ -0,0 +1,24 @@
+//
+//  ShaderTypes.h
+//  Metaballs
+//
+//  Created by Eryn Wells on 10/14/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+#ifndef ShaderTypes_hh
+#define ShaderTypes_hh
+
+#include <metal_stdlib>
+
+struct Vertex {
+    float2 position;
+    float2 textureCoordinate;
+};
+
+struct RenderParameters {
+    /// Projection matrix.
+    metal::float4x4 projection;
+};
+
+#endif /* ShaderTypes_hh */