Add Why TimeGPT notebook

.github/workflows/ci.yaml

@@ -82,4 +82,4 @@ jobs:
         run: pip install uv && uv pip install --system ".[dev]"
 
       - name: Run tests
-        run: nbdev_test --timing --do_print --n_workers 0 --skip_file_re "computing_at_scale|distributed"
+        run: nbdev_test --timing --do_print --n_workers 0 --skip_file_re "computing_at_scale|distributed"

nbs/assets/arima_rst.csv

@@ -0,0 +1,197 @@
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