Updating import gds tutorial (#321)

* Updating import gds tutorial

Author: FilipeFcp

GDSCreation.ipynb

@@ -15,3 +15,4 @@ Tidy3D natively supports the definition of various primitive geometries such as
     ../../PICComponents
     ../../PhotonicCrystalsComponents
     ../../CreatingGeometryUsingTrimesh
+    ../../GDSCreation

GDSImport.ipynb

@@ -30,5 +30,11 @@
     "UnstructuredData.ipynb": ["unstructured_grid.vtu"],
     "MMIMeepBenchmark.ipynb": ["MeepMMI.txt"],
     "Autograd13Metasurface.ipynb": ["logo.png"],
-    "DirectionalCoupler.ipynb": [ "misc/coupler.gds"]
+    "DirectionalCoupler.ipynb": [ "misc/coupler.gds"],
+    "MultipoleExpansion.ipynb": [
+        "misc/mie_electric_dipole",
+        "misc/mie_magnetic_dipole",
+        "misc/mie_electric_quadrupole",
+        "misc/mie_magnetic_quadrupole"
+    ]
 }