added documentation for TecPlotTools

web/content/docs/tools/fileio/TecPlotTools/index.pandoc

++++
+date = "2019-12-03T00:00:00+01:00"
+title = "TecPlotTools"
+author = "Karsten Rink"
+
+[menu]
+  [menu.tools]
+    parent = "Data Import/Export"
++++
+
+## Introduction
+
+This is a utility for handling TecPlot data. At the moment, it is possible to split a file containing ```n``` time steps into ```n``` files contain one time step each, or to convert TecPlot raster data into OGS meshes. All data available for the raster will be converted into cell arrays for the OGS mesh.
+
+This tool may be extended in the future to handle more TecPlot-related functionality.
+
+The tool is part of the official [OpenGeoSys git repository](https://github.com/ufz/ogs).
+
+## Usage
+
+```bash
+   TecPlotTools.exe  -i <string> [-o <string>] [-c] [-s]
+
+
+Where:
+
+   -i <string>,  --input-file <string>
+     (required)  TecPlot input file
+
+   -o <string>,  --output-file <string>
+     output mesh file
+
+   -c,  --convert
+     convert TecPlot data into OGS meshes
+
+   -s,  --split
+     split time steps into seperate files
+```
+
+## Simple example
+
+**Command:**
+```
+TecPlotTools -i Lake.plt -o Lake.vtu -c
+```
+
+**Input:**
+
+![TecPlot-Header of file containing raster data](./PoyangLake-TecPlot.png)
+
+**Output:**
+
+![Converted file visualised in ParaView with all scalar data available.](./PoyangLake-ParaView.png)
+