Add README for tests

tests/README.md

@@ -0,0 +1,18 @@
+# PostgSail Unit Tests
+The Unit Tests allow to automatically validate the workflow.
+
+## A global overview
+Based on `mocha` & `psql`
+
+## get started
+```bash
+$ npm i
+$ alias mocha="./node_modules/mocha/bin/_mocha"
+$ bash tests.sh
+```
+
+## docker
+```bash
+$ docker-compose up -d db && sleep 15 && docker-compose up -d api && sleep 5
+$ docker-compose -f docker-compose.dev.yml -f docker-compose.yml up tests
+```