docs: update README with Docker instructions and details

Enhance the README by adding detailed Docker usage instructions, 
including build, version check, and conversion commands for both 
Windows and Linux. This improves accessibility for users who 
prefer using Docker for the project.

README.md

@@ -66,14 +66,41 @@ result = md.convert("example.jpg")
 print(result.text_content)
 ```
 
-### Docker
+<details>
+<summary>Docker</summary>
+
+#### Build
 
 ```sh
 docker build -t markitdown:latest .
-docker run --rm -i markitdown:latest < ~/your-file.pdf > output.md
 ```
+
+#### Check version
+
+```sh
+docker run --rm markitdown:latest --version
+```
+
+#### Convert
+
+- On Windows (PowerShell):
+
+```sh
+docker run --rm --volume ${pwd}:/src --workdir /src markitdown:latest ./path-to-your-file.pdf
+```
+
+- On Linux:
+
+```sh
+docker run --rm --volume $(pwd):/src --workdir /src markitdown:latest ./path-to-your-file.pdf
+```
+
+Note: When specifying the file path, always use `/` as the separator, even on Windows (e.g., ./my-folder/my-file.pdf).
+
+</details>
+
 <details>
-    
+
 <summary>Batch Processing Multiple Files</summary>
 
 This example shows how to convert multiple files to markdown format in a single run. The script processes all supported files in a directory and creates corresponding markdown files.
@@ -94,7 +121,7 @@ for file in files_to_convert:
         result = md.convert(file)
         with open(md_file, 'w') as f:
             f.write(result.text_content)
-        
+
         print(f"Successfully converted {file} to {md_file}")
     except Exception as e:
         print(f"Error converting {file}: {str(e)}")
@@ -108,7 +135,7 @@ print("\nAll conversions completed!")
 Note that original files will remain unchanged and new markdown files are created with the same base name.
 
 </details>
-   
+
 ## Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a