Add instructions to set the repo to private

[dcspille]

We should add instructions to have the user set the repo to private, so that the date they upload is not publically visible

[cs-sujeet-ahirrao]

We already documented in https://github.com/fortinet-fortisoar/solution-pack-cicd/blob/release/2.0.0/README.md file under "Initial Configuration" section point no 2