Update README.md

added text for CAPEC

README.md

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 # cti
-Cyber Threat Intelligence Repository of ATT&CK catalog expressed in STIX 2.0 JSON. See [USAGE](USAGE.md) for information on using this content with [python-stix2](https://github.com/oasis-open/cti-python-stix2).
+The Cyber Threat Intelligence Repository of ATT&CK and CAPEC catalogs expressed in STIX 2.0 JSON. See [USAGE](USAGE.md) for information on using this content with [python-stix2](https://github.com/oasis-open/cti-python-stix2).
 
 ## ATT&CK
 ATT&CK is a catalog of techniques and tactics that describe post-compromise adversary behavior on typical enterprise IT environments. The core use cases involve using the catalog to analyze, triage, compare, describe, relate, and share post-compromise adversary behavior.
@@ -14,3 +14,14 @@ STIX enables organizations to share CTI with one another in a consistent and mac
 STIX is designed to improve many different capabilities, such as collaborative threat analysis, automated threat exchange, automated detection and response, and more.
 
 https://oasis-open.github.io/cti-documentation/
+
+## CAPEC
+
+Understanding how the adversary operates is essential to effective cyber security. CAPEC™ helps by providing a comprehensive dictionary of known patterns of attacks employed by adversaries to exploit known weaknesses in cyber-enabled capabilities. It can be used by analysts, developers, testers, and educators to advance community understanding and enhance defenses.
+
+ - Focuses on application security
+ - Enumerates exploits against vulnerable systems
+ - Includes social engineering / supply chain
+ - Associated with Common Weakness Enumeration (CWE)
+
+https://capec.mitre.org/