Add Docker requirement in README

Ravi Kumarrequested to merge
update-README-to-include-docker into main
  • Add a requirement to install Docker to run tests.
  • Fix the docker-compose commands. I was getting the error by running docker-compose up gitaly -d. Service name should be the last argument in the command.

Error:

~/ docker-compose up gitaly -d
ERROR: No such service: -d

Working:

~/ docker-compose up -d gitaly                               
gitlab-elasticsearch-indexer_gitaly_1 is up-to-date

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