add_key/4 is an Erlang function exported by "age_registry" module.
This function adds or updates a Key with Data into a Cell within the Hive.
The cell should exist, otherwise the function will return an error.
Each key can be identified and accessed via fully-qualified unix-like path. The hierarchy of the keys is achieved with properly defined paths and names. The name of a key is an alpha-numeric and spaceless string that contains only Latin symbols and Arabic numbers. The allowed path separator to locate a key in the hierarchy is slash '/'. The key name MUST be a fully-qualified name including the root path starting with a slash. Invalid key names lead to function error.
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