Add Layout Designer (a macOS app that makes layout for UICollectionView) (#570)

* Add Layout Designer app https://github.com/amirdew/CollectionViewPagingLayout

* Add Layout Designer to applications.json and remove it from README.md

* Change title of Layout Designer

* Change short description for Layout Desginer

Co-authored-by: Amir Khorsandi <a.khorsandi@innovattic.com>
Co-authored-by: Serhii Londar <serhii.londar@gmail.com>

applications.json

@@ -7931,6 +7931,24 @@
                 "swift"
             ]
         },
+        {
+            "short_description": "A simple but powerful tool that helps you make complex layouts for UICollectionView.",
+            "categories": [
+                "development",
+                "productivity",
+                "utilities"
+            ],
+            "repo_url": "https://github.com/amirdew/CollectionViewPagingLayout",
+            "title": "Layout Designer for UICollectionView",
+            "icon_url": "https://github.com/amirdew/CollectionViewPagingLayout/blob/master/Samples/PagingLayoutSamples/Assets.xcassets/AppIcon.appiconset/icon_40x40@3x.png?raw=true",
+            "screenshots": [
+                "https://amir.app/git/layout_designer_preview.gif"
+            ],
+            "official_site": "https://apps.apple.com/nl/app/layout-designer/id1507238011?l=en&mt=12",
+            "languages": [
+                "swift"
+            ]
+        },
         {
             "short_description": "Mac app that shows pull request last modified each line of a file",
             "categories": [