Add some colors to the initial view (#88)

Gifski/Assets.xcassets/BackgroundImage.imageset/Contents.json

@@ -0,0 +1,18 @@
+{
+  "images" : [
+    {
+      "idiom" : "mac",
+      "filename" : "BackgroundImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "filename" : "BackgroundImage@2x.png",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Gifski/Constants.swift

@@ -11,4 +11,5 @@ extension Defaults.Keys {
 
 struct Constants {
 	static let defaultWindowSize = CGSize(width: 360, height: 240)
+	static let backgroundImage = NSImage(named: "BackgroundImage")!
 }

Gifski/VideoDropView.swift

@@ -67,6 +67,11 @@ class DropView: SSView {
 	override func draw(_ dirtyRect: CGRect) {
 		super.draw(dirtyRect)
 
+		// We only draw it when the drop view controller is the main view controller.
+		if window?.contentViewController is VideoDropViewController {
+			Constants.backgroundImage.draw(in: dirtyRect)
+		}
+
 		if isDraggingHighlighted {
 			highlightColor.set()
 			let path = NSBezierPath(rect: bounds)

Gifski/VideoDropViewController.swift

@@ -2,8 +2,9 @@ import AppKit
 
 final class VideoDropViewController: NSViewController {
 	private let videoValidator = VideoValidator()
+
 	private lazy var videoDropView = with(VideoDropView()) {
-		$0.dropText = "Drop a Video to Convert to GIF"
+		$0.dropText = "Drop a Video"
 		$0.onComplete = { [weak self] url in
 			NSApp.activate(ignoringOtherApps: true)
 			self?.convert(url)