Add Snap installation section to README

Added Snap installation instructions to README.

Author: Aryan20

README.md

@@ -76,10 +76,13 @@ The app only requests **pictures access**, which is used exclusively for attachi
 
 ## Installation
 
-### Flatpak (recommended)
+### Flatpak
 
 Please use the latest release or build using GNOME Builder.
 
+### Snap
+[![Get it from the Snap Store](https://snapcraft.io/en/dark/install.svg)](https://snapcraft.io/open-forms)
+
 ## Sample Config
 
 ```json