Add Flatpak configuration file

com.github.mightycreak.Diffuse.yml

@@ -0,0 +1,19 @@
+app-id: com.github.mightycreak.Diffuse
+runtime: org.gnome.Platform
+runtime-version: '3.36'
+sdk: org.gnome.Sdk
+command: diffuse
+finish-args:
+  - --socket=wayland
+  - --socket=fallback-x11
+  - --share=ipc
+  - --filesystem=home
+modules:
+  - name: diffuse
+    buildsystem: meson
+    sources:
+      - type: git
+        url: https://github.com/MightyCreak/diffuse
+        branch: master
+rename-desktop-file: diffuse.desktop
+rename-icon: diffuse