[electrophysiology_uploader] Added 'Help' content for the elctrophysi…

…ology_uploader module (#8728)

Added 'Help' content for electrophysiology_uploader module.

Fixes #8597

modules/electrophysiology_uploader/help/electrophysiology_uploader.md

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+# Electrophysiology Uploader
+
+This module allows you to upload EEG recordings and browse past uploads.
+
+In the **Browse** tab, you can use the *Selection Filter* section to search for existing uploads.
+
+In the data table, you can click any link in the *Upload Location* column to download the uploaded files.
+
+To upload recordings, click on the **Upload** tab. Select your file for upload and enter the required information about the recording.
+
+Note: The candidate must already be registered in LORIS and the visit label must be known for the study.
+
+Pay attention to the *Notes* for upload rules. Your dataset should be [BIDS-compliant](https://bids-specification.readthedocs.io).