update README.md

Author: mojtaba-arvin

.docker-compose/.redis_pass_file.local

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+devpassword

.gitignore

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+*.idea
+*.vscode
+*.env
+*.redis_pass_file
+

README.md

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 # redis
 Simple Redis service
+
+### Setup password
+to set `Redis` password ,just put password value at
+`.docker-compose/` directory as `.redis_pass_file` file, or use the sample:
+```
+cp .docker-compose/.redis_pass_file.local .docker-compose/.redis_pass_file
+```
+
+### Clients
+
+Clients on the same machine, can join this service by define an external network,
+for example when the client network name is `sample-network` it should define as:
+
+```
+networks:
+    sample-network:
+        external:
+            name: redis_redis-network
+```
+
+The `external` network name, has two part, which are separated by an underline, `redis` is name of the repository, and `redis-network` is the network name of this repository

docker-compose.yml

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+version: '3'
+
+services:
+    redis:
+        image: 'redis:5-alpine'
+        environment:
+            # the path of password in container
+            REDIS_PASS_FILE: /run/secrets/redis-password
+        command: [
+            "sh", "-c",
+            '
+            docker-entrypoint.sh
+            --requirepass "$$(cat $$REDIS_PASS_FILE)"
+            '
+            ]
+        expose:
+            - "6379"
+        volumes:
+            - redis-volume:/data
+            # pass host password to container
+            - ./.docker-compose/.redis_pass_file:/run/secrets/redis-password
+        networks:
+            - redis-network
+
+
+volumes:
+    redis-volume:
+
+networks:
+    redis-network:
+        driver: bridge