Add README and MIT license

LICENSE

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+MIT License
+
+Copyright (c) 2020-2026 DHI A/S
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

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+# ifm — Python API for FEFLOW
+
+Documentation, tutorials and examples for `ifm`, the Python interface to FEFLOW,
+DHI's groundwater modelling system.
+
+**Documentation: https://dhi.github.io/ifm/**
+
+The `ifm` package is not in this repository — it ships with FEFLOW and is
+installed by the FEFLOW installer, with the Python API option selected. What
+lives here is the source of the documentation site above, plus the tutorials,
+examples and model data that go with it.
+
+```python
+import ifm
+
+doc = ifm.loadDocument("myModel.fem")
+print(doc.getNumberOfNodes())
+```
+
+Requires FEFLOW 11.0 and Python 3.11 or newer.
+
+## Layout
+
+- `docs/` — the documentation site published at dhi.github.io/ifm
+- `tutorials/` — getting started, data wrangling, plotting, what's new per release
+- `examples/` — short, focused snippets
+- `extensions/`, `benchmarks/` — longer worked cases
+- `data/` — FEFLOW models used by the notebooks
+
+## License
+
+[MIT](LICENSE), covering the documentation, tutorials and example code in this
+repository. FEFLOW and the `ifm` package itself are proprietary DHI software and
+are not covered by it.