Add docker config and readme on how to use it.

Author: schveiguy

integration-tests/README.md

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+Integration Tests for MySQL Native
+==================================
+
+This sub-project is intended for proving the functionality of the project against a database instance.
+
+See the instructions in the [main README](../README.md#developers---how-to-run-the-test-suite) on how to use this subpackage.
+
+## Docker image
+
+A docker-compose.yml is supplied for convenience when testing locally. It's preconfigured to use the same username/password that is used by default.
+
+To run tests on your machine, presuming docker is installed, simply run:
+
+```
+$ docker-compose up --detach
+```
+
+Once you are finished, tear down the docker instance
+
+```
+$ docker-compose down
+```

integration-tests/docker-compose.yml

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+version: '3.7'
+services:
+  mysql:
+    # Don't use latest (MySQL Server 8.0) as we cannot currently support it
+    image: mysql:5.7
+    restart: always
+    ports: ['3306:3306']
+    environment:
+      - MYSQL_ALLOW_EMPTY_PASSWORD=yes
+      - MYSQL_DATABASE=mysqln_testdb
+      - MYSQL_USER=mysqln_test
+      - MYSQL_PASSWORD=pass123