Update README.md

README.md

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 # Drawing App Client
+
 ---
 
 ## Prerequisite
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 - [Docker](https://www.docker.com/get-started)
 - [make](https://www.gnu.org/software/make/)
 
+- [drawing-app-server](https://github.com/dennzimm/drawing-app-server)
+
 ## Preparations
 
 - **run** `make setup`
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 - **copy** `example.env` to `.env` (**project root**)
 - **fill** the `.env` (project root) with your configuration or leave it as it is (_default configurations_)
 
-
 ## How to run this project (in production mode)
 
 - **run** `make start` **or** `docker-compose -f docker-compose.prod.yml up -d --build`