Add android-builder wrapper command

lib/commands/wrapper.sh

@@ -0,0 +1,17 @@
+#!/data/data/com.termux/files/usr/bin/bash
+set -e
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+source "$ROOT_DIR/lib/common.sh"
+
+if [ -f settings.gradle ] || [ -f build.gradle ] || [ -f app/build.gradle ]; then
+  install_gradle_wrapper_assets "."
+  echo "Gradle wrapper installed."
+  echo
+  echo "Next:"
+  echo "  ./gradlew assembleDebug"
+else
+  echo "Error: run this command from the root of an Android project."
+  echo "Expected files like settings.gradle, build.gradle, or app/build.gradle."
+  exit 1
+fi