Rename master branch to main

[pedsf1968]

Never work on Master branch (production)

Create develop branch for origin to merge other features.

Create Realease to backup differents projets states

Create first RELEASE-1.0.0 for this working Master

[arey]

In the community, the master is going to be replaced by the main branches: https://dev.to/damcosset/replacing-master-in-git-2jim
I think we could wait what GitHub will propose to automate this renaming.

[arey]

A first step : I've created a main branch for the configuration repository: https://github.com/spring-petclinic/spring-petclinic-microservices-config

[arey]

The default branch has been renamed!
master is now named main

If you have a local clone, you can update it by running the following commands.

git branch -m master main
git fetch origin
git branch -u main main
git remote set-head origin -a