Update README.md

README.md

@@ -23,3 +23,21 @@ dictionary, resulting in a worse compression ratio.
 Some of the leading LLM detection tools are ~~[OpenAI's model detector (v2)](https://openai.com/blog/new-ai-classifier-for-indicating-ai-written-text)~~, [GPTZero](https://gptzero.me/), [CrossPlag's AI detector](https://crossplag.com/ai-content-detector/), and [Roberta](https://huggingface.co/roberta-base-openai-detector). Here are each of them compared with the LZMA detector across the test datasets:
 
 ![ROC curve of detection tools](https://github.com/thinkst/zippy/blob/main/ai_detect_roc.png?raw=true)
+
+### Usage
+
+ZipPy will read files passed as command-line arguments, or will read from stdin to allow for piping of text to it. 
+```
+$ python3 zippy.py -h
+usage: zippy.py [-h] [-s | sample_files ...]
+
+positional arguments:
+  sample_files  Text file(s) containing the sample to classify
+
+options:
+  -h, --help    show this help message and exit
+  -s            Read from stdin until EOF is reached instead of from a file
+$ python3 zippy.py samples/human-generated/about_me.txt 
+samples/human-generated/about_me.txt
+('Human', 0.06013429262166636)
+```