add stubs

src/rendering/vulkan/MainPass.zig

@@ -6,7 +6,7 @@ const Device = @import("device.zig").Device;
 const Command = @import("Command.zig");
 const Swapchain = @import("swapchain.zig").Swapchain;
 const Image = @import("image.zig").Image;
-const Camera = @import("Camera.zig");
+const Camera = @import("../Camera.zig");
 const Shader = @import("Shader.zig");
 const Pass = @import("Pass.zig");
 const framebuffer = @import("framebuffer.zig");