structure files

Author: reint-fischer

docs/getting_started/concepts_overview.md

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+---
+file_format: mystnb
+kernelspec:
+  name: python3
+---
+# Parcels concepts
+
+The flexibility of Parcels enables a wide range of applications and the building of complex simulations. In order to help structure your code, this tutorial describes the structure that a Parcels script uses.
+
+Code that uses Parcels is generally built up from four different components: