Add README.md

README.md

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+This repository contains campains of experimental measurements realised with
+the [Owl Positioning System](https://code.lm7.fr/mcy/owlps) and made public to
+be reused by the community. All the files are published under the terms of the
+_Design Science License_ (see the `LICENSE` file).
+
+Each campain lives in its own directory, in which sits a `README.org` file
+(plain text, in the org-mode format) documenting the experimental setup and
+scenarios. The measurement files for a given scenario are in a dedicated
+subdirectory, in which one can also find test reports in plain text format.
+
+This repository being quite big, you may want to do a shallow clone if you're
+not interested in all the history (`git clone --depth 0`). You can also
+download a snapshot archive.