Add app source for F-Droid release (v1.0.11)

Adds the full Android source tree, Gradle wrapper and version catalog,
fastlane store metadata in six languages and the fdroiddata build
recipe. .gitignore now also excludes build output and keystores.
README gains build instructions and an updated structure tree.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015g6ECVSKcBG8CJPrqC3G5o

fdroid/cc.skysparkle.fogwave.yml

@@ -0,0 +1,30 @@
+# Build recipe for the F-Droid main repository.
+# Submit it as metadata/cc.skysparkle.fogwave.yml in a merge request to
+# https://gitlab.com/fdroid/fdroiddata. Descriptions, screenshots and changelogs are read from
+# fastlane/metadata/android in this repository, so they are not repeated here.
+
+Categories:
+  - Multimedia
+License: GPL-3.0-only
+SourceCode: https://git.skysparkle.cc/kalarina/Fogwave
+IssueTracker: https://git.skysparkle.cc/kalarina/Fogwave/issues
+
+AntiFeatures:
+  NonFreeAssets:
+    en-US: Station logos are trademarks of their broadcasters and the background photo is under the Unsplash License.
+
+RepoType: git
+Repo: https://git.skysparkle.cc/kalarina/Fogwave.git
+
+Builds:
+  - versionName: 1.0.11
+    versionCode: 11
+    commit: v1.0.11
+    subdir: app
+    gradle:
+      - yes
+
+AutoUpdateMode: Version
+UpdateCheckMode: Tags
+CurrentVersion: 1.0.11
+CurrentVersionCode: 11