Added basic_redis files

basic_redis/.env_default

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+CONTAINER_NAME=TheNameOfYourContainer
+MYSQL_ROOT_PASSWORD=YourMySQLRootPasswordHere
+MYSQL_USER=wpuser
+MYSQL_PASSWORD=The_wpuser_password_here
+MYSQL_WP_DATABASE=wordpressdb
+EX_PORT=8000
+

basic_redis/README.md

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+INSTRUCTIONS
+
+1. Copy (and edit) .env_default to .env
+2. Run docker-compose
+3. Access the system in http://hostname:$EX_PORT
+4. Follow the system instructions to install WP
+5. Have fun!
+
+.env VARIABLES
+
+The variables in the .env file are the common ones shown in the parent directory README.md
+
+REDIS CONFIGURATION IN WORDPRESS
+
+Install the Redis Object Cache plugin in WordPress and Activate it
+Then, in Settings -> Redis click Enable Object Cache
+For the plugin to function you must add the following in your wp-config.php file:
+define('WP_REDIS_HOST', 'redis');
+define('WP_CACHE_KEY_SALT', 'wp-docker-5DknvYepdjyJMo8gDqrLhrpAJUQ');
+
+The WP_CACHE_KEY_SALT must be unique, so do your best in adapting it.

basic_redis/docker-compose.yml

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+version: '3'
+
+services:
+  db:
+    image: mysql:8.0
+    container_name: "${CONTAINER_NAME}_db"
+    restart: unless-stopped
+    env_file: .env
+    environment:
+      - MYSQL_DATABASE=$MYSQL_WP_DATABASE
+    volumes:
+      - ./dbdata:/var/lib/mysql
+    command: '--default-authentication-plugin=mysql_native_password'
+
+  redis:
+    image: redis
+    container_name: "${CONTAINER_NAME}_redis"
+    restart: unless-stopped
+
+  wordpress:
+    depends_on:
+      - db
+      - redis
+    image: wordpress
+    container_name: "${CONTAINER_NAME}_wp"
+    restart: unless-stopped
+    env_file: .env
+    ports:
+       - $EX_PORT:80
+    environment:
+      - WORDPRESS_DB_HOST=db:3306
+      - WORDPRESS_DB_USER=$MYSQL_USER
+      - WORDPRESS_DB_PASSWORD=$MYSQL_PASSWORD
+      - WORDPRESS_DB_NAME=$MYSQL_WP_DATABASE
+    volumes:
+      - ./wordpress:/var/www/html
+      - ./php/user.ini:/usr/local/etc/php/conf.d/user.ini