Add basic support for Fastlane

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

fastlane/Appfile

@@ -0,0 +1,2 @@
+json_key_file "~/.gradle/fastlane.json"
+package_name "com.nextcloud.talk2"

fastlane/Fastfile

@@ -0,0 +1,18 @@
+# This is the minimum version number required.
+fastlane_version "2.58.0"
+
+skip_docs
+
+## public lanes
+
+desc "Upload Alpha version to play store"
+lane :uploadAlphaToPlayStore do |options|
+    upload_to_play_store(
+        skip_upload_images: true,
+        skip_upload_aab: true,
+        skip_upload_changelogs: true,
+        skip_upload_metadata: true,
+        track: 'alpha',
+        apk: "~/apks-talk/android-talk-" + options[:version] + ".apk",
+    )
+end