started writing of a README file.

Create a basic structure and added the first content

README.md

+TOAR Gridding Tool
+====
+
+# About 
+
+The TOARgridding projects data from the TOAD database () onto a grid. 
+The stations within one cell of the grid are averaged. 
+
+The tool handels the request to the database over the REST API and the subsequent processing.
+The results are provided as xarray objects for subsequent processing by the user.
+
+This project is a beta with some basic functionalities. 
+
+# Installation
+
+Move to the folder you want to create download this project to.
+
+Clone the project from its git repository
+```
+git clone https://gitlab.jsc.fz-juelich.de/esde/toar-public/toargridding.git 
+```
+
+The handling of required packages is done with poetry.
+For installing them go to the new created directory and run poetry
+```
+cd toargridding
+poetry install
+```
+
+# Example
+
+There are at the moment three example provided as jupyter notebooks:
+tests/procude_data.ipynb provides an example on how the high level interface can be used.
+get_sample_data.ipynb downloads already sampled data from the TOAR database. 
+quality_controll.ipynb processes the data of obtained with get_sample_data.ipynb. 
+
+# Supported Grids
+
+The first supported grid is the Cartesian grid.
+
+# Supported Variables
+
+
+