CLI usage instructions

README.md

@@ -1,5 +1,7 @@
 # MarkItDown
 
+[![PyPI](https://img.shields.io/pypi/v/markitdown.svg)](https://pypi.org/project/markitdown/)
+
 The MarkItDown library is a utility tool for converting various files to Markdown (e.g., for indexing, text analysis, etc.)
 
 It presently supports:
@@ -27,7 +29,6 @@ or from the source
 pip install -e .
 ```
 
-
 # Usage
 The API is simple:
 
@@ -39,6 +40,25 @@ result = markitdown.convert("test.xlsx")
 print(result.text_content)
 ```
 
+To use this as a command-line utility, install it and then run it like this:
+
+```bash
+markitdown path-to-file.pdf
+```
+
+This will output Markdown to standard output. You can save it like this:
+
+```bash
+markitdown path-to-file.pdf > document.md
+```
+
+You can pipe content to standard input by omitting the argument:
+
+```bash
+cat path-to-file.pdf | markitdown
+```
+
+
 You can also configure markitdown to use Large Language Models to describe images. To do so you must provide mlm_client and mlm_model parameters to MarkItDown object, according to your specific client.
 
 ```python