Update adversarial emulation

[santosomar]

This pull request includes significant enhancements to the adversarial_emulation/README.md file. The changes provide a comprehensive overview of adversary emulation, including definitions, benefits, and a detailed list of tools available for this practice.

Key updates include:

• Introduction to Adversary Emulation:

  • Added a detailed explanation of adversary emulation, distinguishing it from penetration testing and highlighting its importance in assessing an organization's security posture.

• Tools for Adversary Emulation:

  • Introduced a new section categorizing tools into open-source and other tools, providing descriptions and features for each tool listed.
  • Added detailed descriptions for five open-source tools: MITRE Caldera, Atomic Red Team, Infection Monkey, Stratus Red Team, and Security Datasets.

These changes significantly improve the documentation, making it more informative and useful for readers looking to understand and implement adversary emulation practices.