Add readme

Author: fsimonis

growing-mesh/README.md

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+---
+title: Growing Mesh
+permalink: tutorials-growing-mesh.html
+keywords: python, remeshing
+summary: The growing mesh case is a showcase example of two solvers which grow their mesh at predefined points in time.
+---
+
+{% note %}
+Get the [case files of this tutorial](https://github.com/precice/tutorials/tree/master/growing-mesh). Read how in the [tutorials introduction](https://precice.org/tutorials.html).
+{% endnote %}
+
+## Setup
+
+## Configuration
+
+preCICE configuration (image generated using the [precice-config-visualizer](https://precice.org/tooling-config-visualization.html)):
+
+![preCICE configuration visualization](images/tutorials-growing-mesh-precice-config.png)
+
+## Available solvers
+
+There are two solvers that define the same mesh:
+
+- A who runs first
+- B who runs second
+
+## Running the Simulation
+
+Pass the amount of ranks to the run script of the solvers.
+Not passing a number, runs the simulation on a single rank.
+To run both on a two rank each, use:
+
+```bash
+cd fluid-cpp
+./run.sh 2
+```
+
+and
+
+```bash
+cd solid-cpp
+./run.sh 2
+```