Add blogpost by Sergio Caltagirone

README.md

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             Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK™) is a model and framework for describing the actions an adversary may take while operating within an enterprise network. ATT&CK is a constantly growing common reference for post-access techniques that brings greater awareness of what actions may be seen during a network intrusion. MITRE is actively working on integrating with related construct, such as CAPEC, STIX and MAEC.
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+            <a href="http://www.activeresponse.org/building-threat-hunting-strategy-with-the-diamond-model/" target="_blank">Building Threat Hunting Strategies with the Diamond Model</a>
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+            Blogpost by Sergio Caltagirone on how to develop intelligent threat hunting strategies by using the Diamond Model.
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             <a href="https://cryptome.org/2015/09/cti-guide.pdf" target="_blank">Definitive Guide to Cyber Threat Intelligence</a>