quick instructions in README

README.md

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+# SciPy 2024 Teen Track
+
+<img src="https://raw.githubusercontent.com/jpivarski-talks/2024-07-08-scipy-teen-track/main/make-talk-01/SCIPY-2024-no-textArtboard%2B1%403x.png" width="200" align="right">
+
+This repository contains the materials presented on July 22‒23, 2024 at the SciPy Teen Track.
+
+To follow the lecture and do the exercises, launch JupyterLite in your browser:
+
+<p align="center">
+  <a href="https://jpivarski-talks.github.io/2024-07-08-scipy-teen-track/lab/index.html">
+    <img src="https://jupyterlite.readthedocs.io/en/latest/_static/badge.svg" alt="Launch JupyterLite" height="40">
+  </a>
+</p>
+
+In JupyterLite, the slides and notebooks can all be found in the left-bar (which may be hidden; click the folder icon to reveal them). Each can be opened by double-clicking.
+
+<img src="https://github.com/jpivarski-talks/2024-07-08-scipy-teen-track/assets/1852447/cf26469a-0ae7-428d-9ad7-c8ef90e32dd6" width="400">
+
+In a notebook, you can run a cell by clicking in it and pressing `shift-enter` or `control-enter` (or `command-enter` on Mac). If your Python session dies or needs to be restarted, select the last cell you were working on and "Restart Kernel and Run up to Selected Cell" from the "Kernel" menu.
+
+<img src="https://github.com/jpivarski-talks/2024-07-08-scipy-teen-track/assets/1852447/4fcbd934-da63-433b-8eb7-5a5a1f8737e0" width="400">