BAEL-2275: Move docker directory to test resources. Add README.md for it.

ddd/src/test/resources/com/baeldung/dddhexagonalspring/README.md

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+## Setup DDD Hexagonal Spring Application
+
+To run this project, follow these steps:
+
+* Launch the Spring Boot Application (DomainLayerApplication). 
+* Run the application database by executing `docker-compose up` in this directory.
+* By default, application will connect to this database (configuration in *ddd-layers.properties*)

ddd/src/test/resources/com/baeldung/dddhexagonalspring/docker-compose.yml

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+version: '3'
+
+services:
+  order-mongo-database:
+    image: mongo:3.4.13
+    restart: always
+    ports:
+      - 27017:27017
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: admin
+      MONGO_INITDB_ROOT_PASSWORD: admin
+      MONGO_INITDB_DATABASE: order-database
+    volumes:
+      - ./mongo-init.js:/docker-entrypoint-initdb.d/mongo-init.js:ro

ddd/src/test/resources/com/baeldung/dddhexagonalspring/mongo-init.js

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+db.createUser(
+    {
+      user: "order",
+      pwd: "order",
+      roles: [
+        {
+          role: "readWrite",
+          db: "order-database"
+        }
+      ]
+    }
+);