add filter and badge for downloadCount (#62)

* Added the Download filter and download badge

* Update src/components/library/LibraryMangaGrid.tsx

Co-authored-by: Sascha Hahne <ntbm@users.noreply.github.com>

* - corrected some spelling mistakes

Co-authored-by: Sascha Hahne <ntbm@users.noreply.github.com>

src/typings.d.ts

@@ -35,6 +35,7 @@ interface IMangaCard {
     title: string
     thumbnailUrl: string
     unreadCount?: number
+    downloadCount?: number
 }
 
 interface IManga {
@@ -58,6 +59,7 @@ interface IManga {
 
     freshData: boolean
     unreadCount?: number
+    downloadCount?: number
 }
 
 interface IChapter {