tst_bic: Rewrite README.
tst_bic: Rewrite README.

Split in sections on how to run and how to generate the data,
remove quotes, etc from the commands ready for copy & paste.

Task-number: QTBUG-45864
Change-Id: Ib0b451bde98ca3e98c9030f65c581cc4eb789681
Reviewed-by: Simon Hausmann <a975102812d593b3191088e3d0aeaeb6f11dbcf5@theqtcompany.com>

tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa