add redis

redis/README.md

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+# Redis w/ Docker Compose
+
+Password authentication is achieved through running a custom redis-server command to require the `"password"` password.
+
+## Enter the Container w/ Bash
+
+`docker-compose exec --user root db /bin/bash`
+
+## Enter the Redis Shell
+
+`docker-compose exec --user root db redis-cli`
+
+## Super User Authentication
+
+Password: `password`
+
+While inside the shell, run the following:
+
+```
+AUTH "password"
+```

redis/docker-compose.yml

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+version: '3'
+
+services:
+  db:
+    image: redis:latest
+    command: redis-server --requirepass password
+    ports:
+      - 6379:6379