Add Keka app (#785)

* Add Keka app

* Add Keka info

README.md

@@ -725,6 +725,7 @@ You can see in which language an app is written. Currently there are following l
 - [Touch Emoji](https://github.com/lessmess-dev/touch-emoji) - Emoji picker for MacBook Pro Touch Bar.  ![swift_icon] 
 
 ### Utilities
+- [Keka](https://github.com/aonez/Keka) - Keka is a full featured file archiver, as easy as it can be. ![swift_icon]
 - [Android tool for Mac](https://github.com/mortenjust/androidtool-mac) - One-click screenshots, video recordings, app installation for iOS and Android  ![swift_icon] 
 - [ArchiveMounter](https://github.com/ivoronin/ArchiveMounter) - Mounts archives like disk images. ![swift_icon] 
 - [BeardedSpice](https://github.com/beardedspice/beardedspice) - Control web based media players with the media keys found on Mac keyboards.  ![objective_c_icon] 

applications.json

@@ -1,5 +1,21 @@
 {
     "applications": [
+           {
+            "short_description": "Keka is a full featured file archiver, as easy as it can be.",
+            "categories": [
+                "utilities"
+            ],
+            "repo_url": "https://github.com/aonez/Keka",
+            "title": "Keka",
+            "icon_url": "",
+            "screenshots": [
+                "https://www.keka.io/img/Keka-Square-512x512.png"
+            ],
+            "official_site": "https://keka.io",
+            "languages": [
+                "swift"
+            ]
+        },
         {
             "short_description": "A lightweight and powerful editor for localizing iOS, macOS, tvOS, and watchOS applications.",
             "categories": [