Streamline local Docker environment

Update readme

build/docker-compose.yml

@@ -0,0 +1,22 @@
+wordpress:
+  environment:
+    - WORDPRESS_DB_HOST=db
+    - WORDPRESS_DB_PASSWORD=password
+    - WORDPRESS_DB_USER=windycoys
+  image: 'wordpress:php7.0-apache'
+  links:
+    - db
+  ports:
+    - "80:80"
+  volumes:
+    - ../.tmp/wp-content:/var/www/html/wp-content
+    - ../theme:/var/www/html/wp-content/themes/windycoys
+db:
+  environment:
+    - MYSQL_DATABASE=wordpress
+    - MYSQL_PASSWORD=password
+    - MYSQL_ROOT_PASSWORD=password
+    - MYSQL_USER=windycoys
+  image: 'mariadb:latest'
+  volumes:
+    - ../.tmp/mysql:/var/lib/mysql