fdroid: add page (#3550)

pages/common/fdroid.md

@@ -0,0 +1,29 @@
+# fdroid
+
+> F-Droid build tool.
+> F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform.
+> More information: <https://f-droid.org/>.
+
+- Build a specific app:
+
+`fdroid build {{app_id}}`
+
+- Build a specific app in a build server VM:
+
+`fdroid build {{app_id}} --server`
+
+- Publish the app to the local repository:
+
+`fdroid publish {{app_id}}`
+
+- Install the app on every connected device:
+
+`fdroid install {{app_id}}`
+
+- Check if the metadata is formatted correctly:
+
+`fdroid lint --format {{app_id}}`
+
+- Fix the formatting automatically (if possible):
+
+`fdroid rewritemeta {{app_id}}`