docs: add ipython instructions to readme

Author: backwardspy

README.md

@@ -79,6 +79,19 @@ They can also be accessed by directly importing them:
 from catppuccin.extras.pygments import MacchiatoStyle
 ```
 
+### IPython
+
+A minimal configuration:
+
+```python
+from pygments.styles import get_style_by_name
+
+c = get_config()
+c.TerminalInteractiveShell.highlighting_style = get_style_by_name("catppuccin-mocha")
+```
+
+Putting this into your [IPython configuration](https://ipython.readthedocs.io/en/stable/config/intro.html) and ensuring `catppuccin[pygments]` is installed in the same environment will give you Catppuccin Mocha syntax highlighting in the REPL. See [here](https://github.com/backwardspy/dots/blob/f6991570d6691212e27e266517656192f910ccbf/dot_config/ipython/profile_default/ipython_config.py) for a more complete example configuration.
+
 ## Contribution
 
 If you are looking to contribute, please read through our