ENH : Add Angrist-Krueger QOB (1980 Census) dataset

[Dijo-404]

• This PR adds the Angrist-Krueger QOB (1980 Census) dataset to the example_datasets repository.
• Requested by @DARHWOLF in main pgmpy PR to allow for verification of the dataset and its associated tags.

Related PR: pgmpy/pgmpy#2737

[DARHWOLF]

Thanks, may I request the following changes:-

• please move this outside the real directory. This dataset will have its own directory.
• please include the License file from https://github.com/pgmpy/example_datasets/blob/main/real/LICENSE
• please add a readme for this dataset's directory.
• please add this dataset to the repository's main readme.

[Dijo-404]

Thanks, may I request the following changes:-

* please move this outside the `real` directory. This dataset will have its own directory.

* please include the License file from https://github.com/pgmpy/example_datasets/blob/main/real/LICENSE

* please add a readme for this dataset's directory.

* please add this dataset to the repository's main readme.

Sure working on it.

[Copilot]

Pull request overview

Adds the Angrist–Krueger Quarter-of-Birth (1980 Census) dataset to this example_datasets repository so it can be referenced/validated by pgmpy (per pgmpy#2737).

Changes:

• Introduces a new angrist-krueger-qob/ dataset folder with dataset documentation and CC0 license text.
• Adds the dataset listing entry to the repository root README.md.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
angrist-krueger-qob/README.md	Adds dataset description, citation, and file listing.
angrist-krueger-qob/LICENSE	Adds CC0 1.0 Universal license text for the dataset folder.
README.md	Adds a new entry pointing to the Angrist–Krueger QOB dataset folder.

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[Dijo-404]

Accidentally closed it, having some merge conflicts, working on it

[Dijo-404]

Fixed the issues and added the requested changes. Let me know if everything looks good now

[Dijo-404]

I have done the requested changes

[DARHWOLF]

LGTM when AA approves

[DARHWOLF]

I'm not sure why there is a need to force-push?

[Dijo-404]

I'm not sure why there is a need to force-push?

Every time I sync my fork and pull the latest updates to the branch, I get a merge conflict. That's why I had to rebase and force-push