HPCC-9504 Add README.1st file into testing/regress directory to describe how
to run Regression Suite

A short decription added.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
HPCC-9504 Add README.1st file into testing/regress directory to describe how
to run Regression Suite

Convert Readme.1st to README.rst.

Extend it with new query feature

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
HPCC-9504 Add README.1st file into testing/regress directory to describe how
to run Regression Suite

Updated after review

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #4508 from AttilaVamos/HPCC-9504-documentation

HPCC-9504 Add README.1st file into testing/regress directory to describe how  to run Regression Suite