Upd: Add Flathub link to README

Author: ollm

README.md

@@ -50,6 +50,7 @@ You can see the changes between versions in the [Changelog 📝](https://github.
 <a href="https://apps.microsoft.com/detail/9PDCMVNFZ2KK"><img height="50" alt="Get it from Microsoft" title="Get it from Microsoft" src="https://raw.githubusercontent.com/ollm/OpenComic/master/images/store/microsoft-store.svg" /></a>
 &nbsp;&nbsp;&nbsp;<a href="https://apps.apple.com/app/opencomic/id6464329463"><img height="50" alt="Download on the Mac App Store" title="Download on the Mac App Store" src="https://raw.githubusercontent.com/ollm/OpenComic/master/images/store/mac-app-store.svg" /></a>
 &nbsp;&nbsp;&nbsp;<a href="https://snapcraft.io/opencomic"><img height="50" alt="Get it from the Snap Store" title="Get it from the Snap Store" src="https://raw.githubusercontent.com/ollm/OpenComic/master/images/store/snap-store.svg" /></a>
+&nbsp;&nbsp;&nbsp;<a href="https://flathub.org/apps/app.opencomic.OpenComic"><img height="50" alt="Get it on Flathub" title="Get it on Flathub" src="https://raw.githubusercontent.com/ollm/OpenComic/master/images/store/flathub-store.svg" /></a>
 ###### Windows
 - [.exe](https://github.com/ollm/OpenComic/releases/download/v1.3.1/OpenComic.Setup.1.3.1.exe)
 - [portable.exe](https://github.com/ollm/OpenComic/releases/download/v1.3.1/OpenComic.Portable.1.3.1.exe)

build/flatpak/app.opencomic.OpenComic.desktop

@@ -7,4 +7,5 @@ Icon=app.opencomic.OpenComic
 StartupWMClass=OpenComic
 Comment=Comic and manga reader
 MimeType=application/x-cbz;application/x-cbr;application/x-cb7;application/x-cbt;application/pdf;application/x-bzpdf;application/x-gzpdf;application/epub+zip;
-Categories=Graphics;
+Categories=Graphics;
+Keywords=reader;viewer;comic;manga;epub;pdf;manhwa;manhua;webtoon;webcomic;offline