Readme updated

README.md

@@ -28,6 +28,12 @@ pip install .
 mdlink /path/to/docs
 ```
 
+Scan current directory recursively:
+
+```bash
+mdlink .
+```
+
 ## Options
 
 - `--timeout FLOAT`  
@@ -41,10 +47,33 @@ When a Markdown link redirects, `mdlink` prompts:
 Replace old URL with final URL? [y/N]
 ```
 
-- [broken](https://httpbin.org/status/404)
-
 Only confirmed links are updated.
 
+## Test File And Script
+
+This repository includes:
+
+- `test.sh`: Generates a sample Markdown test file.
+- `test.md`: A sample file with mixed link cases (200, redirect, 404/500, naked URLs, ignored image/non-http links).
+
+Generate or overwrite `test.md`:
+
+```bash
+./test.sh
+```
+
+Generate to a custom file path:
+
+```bash
+./test.sh /tmp/my-test.md
+```
+
+Run the tool against the generated test file:
+
+```bash
+mdlink test.md
+```
+
 ## Help
 
 ```bash