Update README.md

README.md

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 # [cvxball](/book)
 
 [![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/cvxgrp/cvxball)
+
+We compute the smallest enclosing sphere for a set of points.
+
+```bash
+# create a numpy array where each row corresponds to a point
+# Each row should have the same number of elements and they
+# can be higher than 2... :-)
+points = np.array([[2.0, 4.0], [0, 0], [2.5, 2.0]])
+circle = min_circle_cvx(points, solver="CLARABEL")
+
+# display the points & the circle
+fig = create_figure()
+fig.add_trace(circle.scatter())
+fig.add_trace(Cloud(points).scatter())
+fig.show()
+
+```