update README

README.md

@@ -1,25 +1,68 @@
+
 # MOS3 - My Own S3
 ![GitHub](https://img.shields.io/github/license/tttol/mos3) ![GitHub](https://img.shields.io/github/v/release/tttol/mos3)   
 `MOS3` is a mock application for Amazon S3, meaning `My Own S3`, pronounced `mɒsˈθri`.
+![screen image](static/mos3.png)
+
 # Install
 ## Docker
-Run command.
+Run the following command:
 ```bash
 # https://hub.docker.com/r/tttol/mos3
 docker run -p 3333:3333 -v ./upload:/app/upload -it --rm tttol/mos3:latest
 ```
-Then acccess http://localhost:3333/s3 .
+Then access http://localhost:3333/s3.
+
+> [!NOTE]
+> You can replace `./upload` with any path you prefer.
+
+Files uploaded to MOS3 will be saved in `/app/upload`.  
+This means that the files and directories in MOS3 will appear in the host machine's path specified with `-v ./upload:/app/upload`.
 
 ## Docker Compose
-compose.yml is [here](https://github.com/tttol/mos3/blob/main/compose.yml).  
-Run command.
+The `compose.yml` file is [here](https://github.com/tttol/mos3/blob/main/compose.yml).
+
+> [!NOTE]
+> You can replace `./upload` with any path you prefer.
+
+Run the following command:
 ```bash
 docker compose up -d
 ```
 
-Then acccess http://localhost:3333/s3 .
+Then access http://localhost:3333/s3.
+
 # Usage
-TBD
+## Upload file/directory
+You can upload files using the "New File" button at the top right of the screen.  
+To upload directories, create them in the directory mounted to `/app/upload` using commands like `mkdir`.
+
+![New File button](static/newfile.png.png)
+
+## Remove file/directory
+The feature to delete files and directories from the web interface is currently under development.  
+For now, you can use commands like `rm` in the directory mounted to `/app/upload` to delete them.
+
+## Connect your application with MOS3
+Here’s how to connect an application that uses Amazon S3 to MOS3.  
+By default, MOS3 runs on `localhost:3333`. To access MOS3 from your application, set the S3 endpoint to `http://localhost:3333`.  
+Here's an example using the AWS SDK for Java:
+```java
+S3Client s3 = S3Client.builder()
+        .region(region)
+        .endpointOverride(new URI("http://localhost:3333"))
+        .serviceConfiguration(s3Configuration)
+        .build();
+```
+
+> [!NOTE]
+> ```java
+> S3Configuration s3Configuration = S3Configuration.builder()
+> .pathStyleAccessEnabled(true) // enable path style access
+> .build();
+> ```
+> When specifying `localhost` as the endpoint, you may need to enable path style access as shown above.
+
 # TBD
 - Accept requests from AWS SDK for Java (Priority: High)
   - **DL**