Add input/output operations example notebook

[Copilot]

No example existed showing how to read and write SMS++ networks via pySMSpp.

Changes

• docs/examples/io_operations.ipynb — new notebook covering:

  • Loading a network from a NetCDF file via SMSNetwork(fp)
  • Building a network programmatically (SMSNetwork, Block, Variable)
  • Saving with to_netcdf(), including force=True overwrite semantics
  • Round-trip save/reload with structural verification

• mkdocs.yml — registers the notebook under Examples → Input/Output Operations

Example

from pysmspp import SMSNetwork, SMSFileType, Block, Variable
import numpy as np

# Load existing network
net = SMSNetwork("model.nc4")

# Build a new network and save it
sn = SMSNetwork(file_type=SMSFileType.eBlockFile)
sn.add("UCBlock", "Block_0", id="0", TimeHorizon=24, ...)
sn.to_netcdf("output.nc4")

# Reload and verify
reloaded = SMSNetwork("output.nc4")

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add example for input/output operations</issue_title>
<issue_description>Add example for input/output operations</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add example for input/output operations #79

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