building for android impl

currently builds a "Metaforce" apk, will need to change name of course. Running the apk using Android Studio's emulator can get in game, however running on a samsung phone does not seem to work.

platforms/android/scripts/sync-sdl-java.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/../../.." && pwd)"
+SRC_DEFAULT="$ROOT_DIR/build/android-arm64/_deps/sdl-src/android-project/app/src/main/java/org/libsdl/app"
+SRC_DIR="${1:-$SRC_DEFAULT}"
+DST_DIR="$ROOT_DIR/platforms/android/app/src/main/java/org/libsdl/app"
+
+if [[ ! -d "$SRC_DIR" ]]; then
+  echo "SDL Java source directory not found: $SRC_DIR" >&2
+  exit 1
+fi
+
+mkdir -p "$DST_DIR"
+cp -f "$SRC_DIR"/*.java "$DST_DIR"/
+echo "Synced SDL Java sources from $SRC_DIR to $DST_DIR"