DOC: update CHANGELOG

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added ###
 
+* Add TimeZone class and parse the server's time zone in the Info response.
+
 ### Changed ###
 
 * Set PyYAML dependency back to PyYaml>=5.4.1 (from 6.0) for better

src/caosdb/common/timezone.py

 class TimeZone():
+    """
+    TimeZone, e.g. CEST, Europe/Berlin, UTC+4.
 
+
+    Attributes
+    ----------
+    zone_id : string
+        ID of the time zone.
+    offset : int
+        Offset to UTC in seconds.
+    display_name : string
+        A human-friendly name of the time zone:
+    """
     def __init__(self, zone_id, offset, display_name):
         self.zone_id = zone_id
         self.offset = offset