add readme

postgres/readme.md

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+## 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.