update readme

README.md

 # booru-api
 
-# default config/secrets.ts file
+## Setup Instructions
 
-```ts
-const redisConfig: RedisConfig = {
-	host: "127.0.0.1",
-	port: 6379,
-};
+1. Rename the example environment file to `.env`:
+   ```bash
+   mv .example.env .env
+   ```
+
+2. Start the application in detached mode:
+   ```bash
+   docker compose up -d
+   ```
 
+---
+
+## Default `config/secrets.ts` File
+
+```typescript
 const e621Auth: Record<string, string> = {
-	"User-Agent": "domain/1.0 (by username on e621)",
-	Authorization: "Basic " + btoa("username:password"),
+  "User-Agent": "your-domain/1.0 (by your-username on e621)",
+  Authorization: "Basic " + btoa("your-username:your-password"),
 };
 
-export { e621Auth, redisConfig };
+export { e621Auth };
 ```
+
+> **Note**: Replace `your-username` and `your-password` with your e621 account credentials. Update the `User-Agent` string to include your domain and comply with e621's API guidelines.