Add README.md for examples page, for FMI tools examples reference

examples/README.md

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+# Examples
+
+This folder contains a couple of examples you can look at and test the MLFMU tool with.
+Each folder is set up to contain:
+
+* `config`: containing the `.onnx` and `interface.json` files
+* `generated_fmu`: binary FMU files, to serve as examples
+* `<FmuName>`: source files for the FMU
+
+The FMUs in this folder have been validated using [FMU_check].
+
+For further documentation of the `mlfmu` tool, see [README.md](../README.md) or the [docs] on GitHub pages.
+
+<!-- Markdown link & img dfn's -->
+[FMU_check]: https://fmu-check.herokuapp.com/
+[docs]: https://dnv-opensource.github.io/mlfmu/