Create yeti.json

add doc

doc/expansion/yeti.json

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+{
+    "description": "Module to process a query on Yeti.",
+    "logo": "",
+    "requirements": ["pyeti", "API key "],
+    "input": "A domain, hostname,IP, sha256,sha1, md5, url of MISP attribute.",
+    "output": "MISP attributes and objects fetched from the Yeti instances.",
+    "references": ["https://github.com/yeti-platform/yeti", "https://github.com/sebdraven/pyeti"],
+    "features": "This module add context and links between observables using yeti"
+}