Create simple drop game

Exercises/Drop/README.md

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+# Drop
+
+A [libGDX](https://libgdx.com/) project generated with [gdx-liftoff](https://github.com/libgdx/gdx-liftoff).
+
+This project was generated with a Kotlin project template that includes Kotlin application launchers and [KTX](https://libktx.github.io/) utilities.
+
+## Platforms
+
+- `core`: Main module with the application logic shared by all platforms.
+- `android`: Android mobile platform. Needs Android SDK.
+
+## Gradle
+
+This project uses [Gradle](https://gradle.org/) to manage dependencies.
+The Gradle wrapper was included, so you can run Gradle tasks using `gradlew.bat` or `./gradlew` commands.
+Useful Gradle tasks and flags:
+
+- `--continue`: when using this flag, errors will not stop the tasks from running.
+- `--daemon`: thanks to this flag, Gradle daemon will be used to run chosen tasks.
+- `--offline`: when using this flag, cached dependency archives will be used.
+- `--refresh-dependencies`: this flag forces validation of all dependencies. Useful for snapshot versions.
+- `android:lint`: performs Android project validation.
+- `build`: builds sources and archives of every project.
+- `cleanEclipse`: removes Eclipse project data.
+- `cleanIdea`: removes IntelliJ project data.
+- `clean`: removes `build` folders, which store compiled classes and built archives.
+- `eclipse`: generates Eclipse project data.
+- `idea`: generates IntelliJ project data.
+- `test`: runs unit tests (if any).
+
+Note that most tasks that are not specific to a single project can be run with `name:` prefix, where the `name` should be replaced with the ID of a specific project.
+For example, `core:clean` removes `build` folder only from the `core` project.