Update README.md

README.md

+## Before you start this application
+
+1. You have to install Maven:
+
+   1. Have a JDK installation on your system. Either set the JAVA_HOME environment variable pointing to your JDK installation or have the java executable on your PATH.
+   2. Download zip from here [https://maven.apache.org/download.cgi]
+   3. Extract distribution archive in any directory
+   4. Unzip apache-maven-3.9.7-bin.zip
+   5. Add the bin directory of the created directory apache-maven to the PATH environment variable.
+   6. Confirm with ```mvn -v``` in a new shell. The result should look similar to
+
+      ```Apache Maven 3.9.7 (8b094c9513efc1b9ce2d952b3b9c8eaedaf8cbf0)
+      Maven home: /opt/apache-maven-3.9.7
+      Java version: 1.8.0_45, vendor: Oracle Corporation
+      Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre
+      Default locale: en_US, platform encoding: UTF-8
+      OS name: "mac os x", version: "10.8.5", arch: "x86_64", family: "mac"```
+
+2. You have to install node
+
+   1. Download the installer here [https://nodejs.org/en/download/prebuilt-installer]
+   2. Click through the installer
+   3. Confirm with ```node -v``` in a new shell. The result should look similar to ```v20.14.0```
+   4. Confirm with ```npm -v```. The result should look similar to ```10.7.0```
+
 ## How to start this application
 
 1. Open up a terminal