Add 5 new cybersecurity skills batch 2 - oauth token theft, binary exploitation, STIX2 sharing, linux audit logs, timestomping detection

skills/implementing-security-information-sharing-with-stix2/SKILL.md

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+---
+name: implementing-security-information-sharing-with-stix2
+description: >
+  Create, validate, and share STIX 2.1 threat intelligence objects using
+  the stix2 Python library. Covers indicators, malware, campaigns,
+  relationships, bundles, and TAXII 2.1 publishing.
+domain: cybersecurity
+subdomain: threat-intelligence
+tags: [stix, taxii, threat-sharing, intelligence-exchange]
+version: "1.0"
+author: mahipal
+license: Apache-2.0
+---
+
+# Implementing Security Information Sharing with STIX 2.1
+
+Build and share structured threat intelligence using STIX 2.1 objects
+with the stix2 Python library and TAXII 2.1 transport protocol.