flatpak usage

Installation.md

@@ -23,6 +23,14 @@ _Originally posted by @celogeek in https://github.com/darodi/kcc/issues/4#issuec
 Or you could also have a look at this other project:
 https://github.com/celogeek/go-comic-converter
 
+### FLATPAK 
+to use `kcc-c2e` or `kcc-c2p`, us this command
+
+
+```bash
+flatpak run --command=kcc-c2e io.github.ciromattia.kcc "$@"
+```
+
 
 ### APPIMAGE
 - install 7zip