Add testing notebook to repo (#7)

Author: slcoplin

test-your-dispatch-integration/README.md

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+This folder contains a Marimo notebook that can be used to test your integration with the Voltus API.
+
+The notebook is visible from https://api.voltus.co/docs/tutorials/test-your-dispatch-integration and is visible in Marimo's molab.
+
+To run locally, install uv and run:
+
+```
+uv run marimo edit test-your-dispatch-integration.py --watch
+```

test-your-dispatch-integration/pyproject.toml

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+[project]
+name = "test-your-dispatch-integration"
+version = "1.0.0"
+description = "Marimo notebook for testing Voltus API integrations"
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "marimo[recommended]>=0.23.11",
+    "numpy>=2.4.6",
+    "pandas>=3.0.3",
+    "python-dateutil>=2.9.0.post0",
+    "pytz>=2026.2",
+]