transmission: Add Tremotesf to list of client apps

Test:

- From F-droid, install and configure the app. Ensure that it works with
FreedomBox.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/transmission/manifest.py

@@ -2,12 +2,28 @@
 
 from django.utils.translation import gettext_lazy as _
 
+from plinth.clients import store_url
+
 clients = [{
     'name': _('Transmission'),
     'platforms': [{
         'type': 'web',
         'url': '/transmission'
     }]
+}, {
+    'name':
+        _('Tremotesf'),
+    'platforms': [{
+        'type': 'store',
+        'os': 'android',
+        'store_name': 'f-droid',
+        'url': store_url('f-droid', 'org.equeim.tremotesf')
+    }, {
+        'type': 'store',
+        'os': 'android',
+        'store_name': 'google-play',
+        'url': store_url('google-play', 'org.equeim.tremotesf')
+    }]
 }]
 
 backup = {