merge readme files

plpgsql/pgunit/readme.md

@@ -1,10 +0,0 @@
-## Requirement
-Testing on postgres 12  
-Unit test framework used : pgunit (https://github.com/adrianandrei-ca/pgunit)  
-
-## Setup
-Run `docker-compose up -d` to start, and `docker-compose exec database bash` to enter in container.  
-You can run `cat update_quality.sql run_tests.sql | psql -d kata -f -`
-
-## Kata
-`update_quality.sql` contains code to refactor, and `run_tests.sql` contains test examples.