LamineCisse/BEP032-examples: channel_type added in channel.tsv (BEP standard) add PowerLineFrequency in ephys-json for ephys_nwb_petersen file add PowerLineFrequency and PowerLineFrequencyUnit in ephys-json for ephys_nix file @ StandardBepFormat

Lamine Cisse c332158044 add column PowerLineFrequency		2 vuotta sitten
..
sub-MS10	c332158044 add column PowerLineFrequency	2 vuotta sitten
sub-MS12	c332158044 add column PowerLineFrequency	2 vuotta sitten
sub-MS13	c332158044 add column PowerLineFrequency	2 vuotta sitten
sub-MS21	c332158044 add column PowerLineFrequency	2 vuotta sitten
sub-MS22	c332158044 add column PowerLineFrequency	2 vuotta sitten
dataset_description.json	e0ae10ea0b gin commit from Saksham	3 vuotta sitten
participants.tsv	e0ae10ea0b gin commit from Saksham	3 vuotta sitten