feat: sleek (#1642)

* Create sleek.yml

sleek/sleek.yml

@@ -0,0 +1,31 @@
+name: sleek
+description: 'sleek is a todo app based on todo.txt, free and open-source'
+website: 'https://github.com/ransome1/sleek'
+repository: 'https://github.com/ransome1/sleek'
+snapcraftName: sleek
+keywords:
+  - todo
+  - todo.txt
+  - productivity
+  - task manager
+  - todo manager
+  - open source
+  - reminders
+  - lists
+category: 'Productivity'
+license: MIT
+screenshots:
+  -
+    imageUrl: 'https://raw.githubusercontent.com/ransome1/sleek/master/assets/screenshots/mac/main.png'
+    caption: 'sleeks main view'
+    imageLink: 'https://github.com/ransome1/sleek'
+  -
+    imageUrl: 'https://raw.githubusercontent.com/ransome1/sleek/master/assets/screenshots/mac/main_filter_dark.png'
+    caption: 'sleeks main view in dark mode, filter drawer opened'
+    imageLink: 'https://github.com/ransome1/sleek'
+locales:
+  - de-DE
+  - en-GB
+  - fr-FR
+  - es-ES
+  - it-IT