docs(ansible): Add steps to add a new target in ansible

[Aashirwadjain]

Description

• This PR aims to add documentation to add a new target to ansible-install.

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[pranav-new-relic]

@Aashirwadjain; nice work on identifying steps, but it doesn't look like the steps are clear enough for someone to be able to contribute, especially when we know there could be peers from other teams who could never have used Ansible so far but are expected to contribute to add a new target. Kindly take a look at my comments and correct accordingly, thanks

[Aashirwadjain]

@pranav-new-relic, I have addressed the changes based on your suggestions.