def project_community(index, start, end):
    """Compute the metrics for the project community section of the enriched
    github pull requests index.

    Returns a dictionary containing "author_metrics", "people_top_metrics"
    and "orgs_top_metrics" as the keys and the related Metrics as the values.

    :param index: index object
    :param start: start date to get the data from
    :param end: end date to get the data upto
    :return: dictionary with the value of the metrics
    """
    results = {'author_metrics': [], 'people_top_metrics': [],
        'orgs_top_metrics': []}
    return results
