prepare for move

...ava/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png

...va/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png

grpc-common/java/android/app/src/main/res/values/strings.xml

grpc-common/java/android/build.gradle

grpc-common/java/android/gradle/wrapper/gradle-wrapper.jar

...mon/java/android/gradle/wrapper/gradle-wrapper.properties

grpc-common/java/android/gradlew

grpc-common/java/android/gradlew.bat

grpc-common/java/android/settings.gradle

grpc-common/java/javatutorial.md

grpc-common/node/.gitignore

grpc-common/node/README.md

grpc-common/node/greeter_client.js

grpc-common/node/greeter_server.js

grpc-common/node/helloworld.proto

grpc-common/node/package.json

grpc-common/node/route_guide/README.md

grpc-common/node/route_guide/route_guide.proto

grpc-common/node/route_guide/route_guide_client.js

grpc-common/node/route_guide/route_guide_db.json