README: add section 'usage on Jupyter notebooks' (#1)

README.md

@@ -1,2 +1,20 @@
 # ocaml-matplotlib
 Plotting for ocaml using matplotlib pyplot and object-orient apis.
+
+
+## Use in Jupyter notebooks
+To use in an `ocaml` `jupyter` notebook, you can add the following in you jupyter init script, or in a notebook cell.
+
+```ocaml
+open Matplotlib;;
+let plot () =
+ let data = Mpl.plot_data `png in
+ ignore (Jupyter_notebook.display ~base64:true "image/png" data);;
+
+let () =
+ Mpl.set_backend Agg;
+ Mpl.style_use "ggplot"
+;;
+```
+
+Using `plot` in the notebook then flushes the current picture and displays it (no need for a temporary file, everything is in memory).