Added section on polynomial evaluation to the notebook

docs/shell.nix

@@ -0,0 +1,22 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+let 
+  pythonPackages = pkgs.python3.withPackages (p: with p; [
+    ipython
+    jupyterlab
+    scipy
+    sympy
+    bokeh
+    bkcharts
+  ]);
+in
+
+pkgs.mkShell {
+
+  buildInputs = [
+    pythonPackages
+
+    # keep this line if you use bash
+    pkgs.bashInteractive
+  ];
+}