Create README.md

Author: RemiLehe

README.md

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+# openPMD example datasets
+
+These are example of [openPMD](http://www.openpmd.org/#/start) datasets, in three different geometries:
+- 2D Cartesian
+- 3D Cartesian
+- Cylindrical with azimuthal decomposition ("thetaMode")
+
+In order to obtain these datasets:
+- Clone this repository
+```
+git clone https://github.com/openPMD/openPMD-example-datasets.git
+```
+- Uncrompress the files
+```
+cd openPMD-example-datasets
+tar -zxvf example-2d.tar.gz
+tar -zxvf example-3d.tar.gz
+tar -zxvf example-thetaMode.tar.gz
+```