Added postgres, mysql and mailhog.

.gitignore

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+postgres/data/
+mysql/data/
+

mailhog/docker-compose.yml

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+version: '2'
+
+services:
+  mailhog:
+    image: mailhog/mailhog:v1.0.0
+    container_name: mailhog
+    restart: always
+    ports:
+      - 1025:1025
+      - 8025:8025

mysql/docker-compose.yml

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+version: '2'
+
+services:
+  mysql:
+    image: mysql:5.7
+    container_name: mysql
+    restart: always
+    ports:
+      - 3306:3306
+    environment:
+      - MYSQL_ROOT_PASSWORD=root
+    volumes:
+      - /home/marvin/docker/mysql/data:/var/lib/mysql

postgres/docker-compose.yml

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+version: '2'
+
+services:
+  mysql:
+    image: postgres:10
+    container_name: postgres
+    restart: always
+    ports:
+      - 5432:5432
+    environment:
+      - POSTGRES_PASSWORD=postgres
+    volumes:
+      - /home/marvin/docker/postgres/data:/var/lib/postgresql/data
+