Added readme

Author: Zabuzard

README.md

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+Welcome to the **Elevator Event** hosted by **Together Java**!
+
+## What is this?
+
+This event consists of a guided course, in which you will create an elevator system that
+transports humans in a building from floor to floor, as well as an actual contest where you
+are required to finish the implementation, try to improve your solution to reduce the time humans
+have to wait, and finally polish your submission.
+
+The event is **ideal for beginners** who feel confident with writing
+small applications already. In fact, this task is inspired by a commonly executed application test for
+Junior developers at companies, called the _Elevator Test_.
+
+## Prizes
+
+### Jetbrains All Product Pack
+
+Among all working submissions (elevators have to eventually transport humans to their destinations),
+we will randomly give away a month license for the [**All Products Pack**](https://www.jetbrains.com/all/)
+by **JetBrains**, sponsored by **Taz** (thanks 🎉).
+
+![Taz#1072](https://i.imgur.com/N4cJdVF.png)
+
+This will get you access to **all JetBrains desktop tools** including 11 IDEs, 3 extensions and 2 profilers.
+
+![all products pack](https://i.imgur.com/IL4dDs0.png)
+
+### Roles
+
+Additionally, submissions will be graded and the top users are awarded with
+a fancy role and a shiny badge!
+
+![role and badge](https://i.imgur.com/Uvg0WlA.png)
+
+## How to submit
+
+The event runs for one week. Until then, please submit your solution per DM to any of the
+moderators of Together Java.
+
+The easiest way to share your results is by just zipping the whole project folder.
+We will accept any format, as long as it is clear what you have changed in the source code.
+
+## Need help
+
+If you have trouble solving the tasks, or something is just unclear to you,
+feel free to openly ask in the server.
+
+Besides being a contest, this is also meant as learning experience.
+So we will definitely provide you with assistance 👍
+
+Enjoy and happy coding 🙌
+
+### Known issues
+
+#### Gradle uses wrong JVM
+
+In case you encounter an error message, such as:
+
+![Cause: error: invalid source release: 17](https://i.imgur.com/xrT39xi.png)
+
+Go to your Gradle settings (you can find them on the right, or directly in Intellij Settings):
+
+![gradle settings](https://i.imgur.com/7ECw8Jw.png)
+
+and select a JDK 17 instead of `#JAVA_INTERNAL`:
+
+![select version](https://i.imgur.com/h1FFXYn.png)