UI - Started work on the gradient picker service now that my POC works

src/Artemis.UI.Shared/Services/GradientPickerService.cs

@@ -0,0 +1,8 @@
+using Artemis.UI.Shared.Services.Interfaces;
+
+namespace Artemis.UI.Shared.Services
+{
+    public class GradientPickerService : IGradientPickerService
+    {
+    }
+}

src/Artemis.UI.Shared/Services/Interfaces/IGradientPickerService.cs

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+namespace Artemis.UI.Shared.Services.Interfaces
+{
+    public interface IGradientPickerService : IArtemisSharedUIService
+    {
+        
+    }
+}