Add changelog.

app/CHANGELOG.md

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+# Changelog
+
+Version history for HyperGames.
+
+## 0.1.0 (2026-11-04)
+
+**Internal Facelift**
+
+- Newer Android SDKs
+  - Icon is the correct size, no longer gets padded.
+  - Screens no longer get hidden by action bar.
+- Upgrades
+  - Migrated from AppCompat libraries to AndroidX.
+  - Updated plugin versions such as AGP and Gradle.
+- APK for release is now filtered to arm-v8a.
+
+minSDK is now 21 from 14.
+
+## 0.0.11 (2025-07-22)
+
+- Minify the APK. Reduced from 1.7MB to 1.3MB with a single setting change.
+- Deleted APK from the previous release since no other changes were made.
+
+## 0.0.10 (2025-07-22)
+
+- Begin targeting SDK 36 (Android 16).
+- Remove ad-related code.