First explanation

README.md

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+# misp-galaxy
+
+MISP galaxy is a simple method to express a large object called cluster that can be attached to MISP events or
+attributes. A cluster can be composed of one or more elements. Elements are expressed as key-values. There
+are default elements available in MISP galaxy but those can overwritten, replaced or updated as you wish.
+
+Existing clusters and elements can be used as-is or as a template.
+
+# Available clusters
+
+- [cluster/threat-actor.json](cluster/threat-actor.json) - Threat Actor
+
+# Available Elements
+
+- [elements/apt-groups.json](elements/apt-groups.json) - APT Groups - Known or estimated adversary groups targeting organizations and employees. Adversary groups are regularly confused with their initial operation or campaign.
+- [elements/threat-actor-intended-effect-vocabulary.json](elements/threat-actor-intended-effect-vocabulary.json) - The IntendedEffectVocab is the default STIX vocabulary for expressing the intended effect of a threat actor. STIX 1.2.1
+
+## How to contribute?
+
+Fork the project, update elements or clusters and make a pull-request.
+