add main functions

README.md

@@ -1,3 +1,19 @@
 # typst-notebook-cell-importer
 
-Typst "package" to include the output/content of ipynb notebook cells.
+Typst "package" to include the output/content of ipynb notebook cells.
+
+
+## Usage
+For now this isn't published to the typst package registry so it needs to be imported as a local file:
+
+```
+#import "importer/main.typ": *
+
+// Usage is:
+image_cell(...)
+code_cell(...)
+code_reference_cell(...)
+```
+
+
+The easiest way is to include this repo as a submodule in your main git repository.