more zot api documentation

doc/api/api_group_members.md

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+API group_members
+=================
+
+GET /api/z/1.0/group_members
+
+
+
+Required:
+
+	group_id or group_name
+
+
+Returns:
+
+	abook+xchan (DB join) for each member of the privacy group 
+

doc/api/group.md

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+API group
+=========
+
+GET /api/z/1.0/group
+
+
+Description: list privacy groups
+
+
+Returns: DB tables of all privacy groups. To use with API group_members, provide group_id from the id element returned in this call, or group_name from the gname returned in this call.
+
+