Add redis dockerfile

nginx/README.md

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+# Run Container
+
+```sh
+$ docker run --name together-nginx --network together-net -itd together-nginx:<version>
+```

postgres/README.md

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+# Run Container
+
+```sh
+$ docker run --name together-postgres --network together-net -v together-postgres:/var/lib/postgresql/data -itd together-postgres:<version>
+```

redis/Dockerfile

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+FROM redis
+EXPOSE 6379

redis/README.md

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+# Run Container
+
+```sh
+$ docker run --name together-redis --network together-net -v together-redis:/data -itd together-redis:<version>
+```