Update calibre.md

Author: ivan-hc

apps/calibre.md

@@ -2,6 +2,7 @@
 
  Calibre is an e-book manager. It can view, convert, edit and catalog  e-books in all of the major e-book formats. It can also talk to e-book  reader devices. It can go out to the internet and fetch metadata for  your books. It can download newspapers and convert them into e-books  for convenient reading. It is cross platform, running on Linux,  Windows and macOS.
 
+ This is the unofficial AppImage built from the official portable package.
 
  ![2024-01-20_01-54](https://github.com/nazdridoy/Portable-Linux-Apps.github.io/assets/45564804/cf633ad3-3a81-4e58-a215-80b66c1610d6)
 
@@ -13,5 +14,7 @@
 
  SOURCE: https://github.com/kovidgoyal/calibre
 
+ APPIMAGE: https://github.com/ivan-hc/Calibre-appimage
+
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