Update README.md

Author: Astro36

README.md

@@ -2,6 +2,7 @@
 
 > Member Management Service
 
+[![GitHub Release](https://img.shields.io/github/v/release/int-i/integer?logo=github&logoColor=white&style=for-the-badge)](https://github.com/int-i/integer/releases/)
 [![Rust](https://img.shields.io/badge/rust-2018-black.svg?logo=rust&logoColor=white&style=for-the-badge)](https://doc.rust-lang.org/edition-guide/rust-2018/index.html)
 [![Rocket](https://img.shields.io/badge/rocket-0.5.0-d33847.svg?logo=data:image/svg+xml;base64,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&style=for-the-badge)](https://rocket.rs/)
 [![PostgreSQL](https://img.shields.io/badge/postgres-13-4169e1.svg?logo=postgresql&logoColor=white&style=for-the-badge)](https://www.postgresql.org/docs/13/index.html)
@@ -48,6 +49,7 @@
 ### Requirement
 
 - [Docker](https://www.docker.com/)
+- `db/password.txt` - a DB password file
 - `cert.pem` - a certificate
 - `key.pem` - a private key
 
@@ -59,13 +61,19 @@
     $ docker build -t integer_api .
     ```
 
-2. Create a Docker secret for `site.pem`:
+2. Create a Docker secret for `postgres_password`:
+
+    ```bash
+    $ docker secret create postgres_password db/password.txt
+    ```
+
+3. Create a Docker secret for `site.pem`:
 
     ```bash
     $ cat cert.pem key.pem | docker secret create site.pem -
     ```
 
-3. Deploy the application to Docker Swarm
+4. Deploy the application to Docker Swarm:
 
     ```bash
     $ docker swarm init
@@ -78,34 +86,44 @@
 
 #### GET /members/{id}
 
-회원 정보 조회
+Fetch member public information by the given member id.
 
 ##### Output
 
 ```json
 {
     "id": 12191765,
-    "name": "박승재",
+    "name": "inti",
     "admission_year": 19
 }
 ```
 
 #### GET /members/{id}/contacts
 
-회원 연락처 정보 조회
+Fetch member contacts by the given member id.
 
 ##### Output
 
 ```json
 {
     "id": 12191234,
-    "name": "박승재",
+    "name": "inti",
     "admission_year": 19,
     "phone": "010-1234-5678",
     "email": "[email protected]"
 }
 ```
 
+### Environment Variables
+
+- `DB_HOST` (optional, default: `localhost`)
+- `DB_NAME` (optional, default: `integer`)
+- `DB_USER` (required)
+- `DB_PASSWORD` (optional)
+- `DB_PASSWORD_FILE` (optional)
+
+Note: Integer requires either `DB_PASSWORD` or `DB_PASSWORD_FILE` to be set.
+
 ## License
 
 ```text