feat(cyber_security): add package scaffold and README

Author: Saiprashanth Pulisetti

cyber_security/README.md

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+# Cyber Security Utilities
+
+Small, self-contained scripts for practical security tasks. Each script can be
+run as a module or imported.
+
+## Modules
+
+- password_strength_checker: Estimate password strength (entropy) and provide feedback.
+- hash_cracker: Hash cracker using a wordlist, supports md5/sha1/sha256.
+- port_scanner: Multithreaded TCP port scanner with banner grabbing.
+- file_integrity_monitor: Initialize and verify file integrity baselines.
+- url_analyzer: Heuristic URL analyzer for phishing and IDN homograph risks.
+
+## Usage
+
+Run any script as a module:
+
+```bash
+python -m cyber_security.password_strength_checker --help
+python -m cyber_security.hash_cracker --help
+python -m cyber_security.port_scanner --help
+python -m cyber_security.file_integrity_monitor --help
+python -m cyber_security.url_analyzer --help
+```
+
+These are educational utilities and should be used responsibly and legally.

cyber_security/__init__.py

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+"""Cyber security utilities.
+
+This package includes small, self-contained scripts useful for learning or
+performing basic security-related tasks, such as:
+
+- Password strength estimation
+- Hash cracking
+- TCP port scanning with banner grabbing
+- File integrity monitoring (hash baseline and verification)
+- URL analysis with phishing heuristics
+
+Each module is runnable as a script (python -m cyber_security.<module>) and
+also importable for use in other code.
+"""
+
+__all__ = [
+    "password_strength_checker",
+    "hash_cracker",
+    "port_scanner",
+    "file_integrity_monitor",
+    "url_analyzer",
+]
+
+