[electrophysiology_browser] Add help directory and missing docs

modules/electrophysiology_browser/help/electrophysiology_browser.md

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+# Electrophysiology Browser
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+This module allows you to review information on EEG scans that were done accross a study.
+
+The selection filter allows you to narrow down candidate sessions. Clicking on one of the columns in the data table allows you to sort alphabetically or numerically by that column. Individual sessions can be accessed by clicking on the *raw* (for raw datasets) or *all types* (for all data) links of one of the rows under the links column, which will redirect you to the *View Session* page.

modules/electrophysiology_browser/help/view_session.md

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+# View Session
+
+This page displays all available information collected for an individual scan session.
+
+Summary information about the candidate, the scan session and the hardware used is displayed.
+
+Scan files (EEG, Electrode info, Channels info and Events) can be downloaded individually or as a compressed folder (*All Files* download).
+On the left, *Next* and *Previous* buttons can be used to navigate between sessions by their number (the leftmost column in the front page of the module). The main page of the module can be navigated back to by clicking on its name in the breadcrumb trail palced the top of the page.
+