More info on issues when starting the cluster. #92

I wanted to use the examples and I have tried it on three different machines (Windows with WSL, Fedora and Ubuntu 24.04). On two of them I have encoutered the folowing issues:

1. Windows with WSL.
   Issue:

• OpenMFP would not start by the time the timeoput is reached. The cause is that there were not enough file descriptors. So they have to be increased. I believe this could help the users following the tutorial.
  Solution:
• Increase the max number of file descriptors:

echo "fs.file-max = 1000000" >> /etc/sysctl.conf
sysctl -p

2. Ubuntu 24.04:
   Issue:

• The embedded Keycloak would not start, so the OpenMFP wait would also timeout.
  Solution:
• Increase the maximum allowed memory in the Keycloak ReplicaSet to 1.5Gi