The README documented individual scripts but not the githubapi.py module that all scripts depend on.

Added comprehensive documentation section covering:

• Module overview: Authentication, pagination, rate limiting, and GHAS alert access
• GitHub class: Initialization patterns for github.com, GHES, custom CA bundles, and TLS options
• Core methods: query(), list_code_scanning_alerts(), list_secret_scanning_alerts(), list_dependabot_alerts()
• Utility functions: parse_date() with relative (7d) and absolute date formats
• Error handling: Automatic rate limit backoff and connection error behavior

Example usage:

from githubapi import GitHub, parse_date

gh = GitHub()
since = parse_date("30d")

for alert in gh.list_secret_scanning_alerts(
    name="my-org",
    scope="org", 
    state="open",
    since=since
):
    print(f"{alert['secret_type']} in {alert['repository']['full_name']}")

Positioned between Requirements and Usage sections for logical flow from setup → library → scripts.

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