Update README with a note or 2

....we'll need to fill it out, but that can wait until tomorrow :P

README.md

@@ -1,3 +1,14 @@
 # film-poster-genres
 
-Predicting film genres from their posters with Tensorflow.js
+> Predicting film genres from their posters with Tensorflow.js
+
+
+To use:
+
+```bash
+node src/index.mjs train --input datasets/posters-256/ --output output/
+node src/index.mjs predict --input datasets/posters-256/validate/25410,Comedy,Family,Drama.jpg --ai-model output/checkpoints/49 2>/dev/null
+```
+
+
+TODO: Fill out this README (and maybe move it to GitHub & make this repo a clone)