Improve README logo spacing

Summary:
Phabricator prints the README all in preformatted code block,
excepted the sixth line, because there is no leading space.

This change fixes this issue by prepending two spaces to the ASCII logo.

Remove trailing spaces.

Test Plan: Check https://devcentral.nasqueron.org/diffusion/ZR/

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1079