Add manifest file to support Parliament indexing

[geosmashing]

Parliament is the name of our internal documentation website for developers, available at https://developers.corp.adobe.com/

We've been asked to add this body of knowledge to Ada bot's index, in order to provide automated support in the #app-builder channel in Slack.

In order to do so, we need to make these markdown pages available on Parliament. It will be onboarded on a non-discoverable (private) project, so it won't be generally available.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9876902) to head (854ed5c).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #756   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          243       243           
  Branches        49        49           
=========================================
  Hits           243       243           

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[geosmashing]

Superseded by #757