Update the project template README.md

[ankatiyar]

NOTE: Kedro datasets are moving from kedro.extras.datasets to a separate kedro-datasets package in
kedro-plugins repository. Any changes to the dataset implementations
should be done by opening a pull request in that repository.

Description

Fix #2305

Development notes

Updated the project's README.
It was already mostly up-to-date on the develop branch except for the changes I made.

Developer Certificate of Origin

We need all contributions to comply with the Developer Certificate of Origin (DCO). All commits must be signed off by including a Signed-off-by line in the commit message. See our wiki for guidance.

If your PR is blocked due to unsigned commits, then you must follow the instructions under "Rebase the branch" on the GitHub Checks page for your PR. This will retroactively add the sign-off to all unsigned commits and allow the DCO check to pass.

Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[ankatiyar]

@AhdraMeraliQB @SajidAlamQB @merelcht What do you think about the other thing mentioned in the issue - wrt adding a README.md to the template's docs/source folder? In the context of #3376, I didn't write a guide yet if there's still changes to be made and will need to be updated in two places (docs and the Readme file).

[merelcht]

LGTM! 👍

wrt adding a README.md to the template's docs/source folder?

I'd leave this for now, because of the issue you mentioned but also because it would again at files to the template which might not be necessary if the docs are clear enough.