Update README.md

README.md

@@ -3,6 +3,7 @@ the python notebooks used for the lesson "Spatial is Special: geo techologies an
 
 <img src="https://raw.githubusercontent.com/napo/geospatial_bigdive/master/img/welcome_bigdive_geospatial.png" width="600">
 
+## tutorials
 The lesson is in 6 modules:
 1. [GIS introduction with geopandas (vector data)](https://raw.githubusercontent.com/napo/geospatial_bigdive/master/01_GIS_introduction_with_geopandas_(vector_data)_bigdive.ipynb)
 2. [Spatial relationships and operations](https://raw.githubusercontent.com/napo/geospatial_bigdive/master/02_Spatial_relationships_and_operations_bigdive.ipynb)
@@ -15,17 +16,16 @@ The lesson is in 6 modules:
 note:<br/>
 This tutorial is related only for vector data
 
+## how to use with Colab
+
 The scripts are created with [Colab](https://colab.research.google.com)<br/>
 Look here how import<br/>
 <img src="https://raw.githubusercontent.com/napo/geospatial_bigdive/master/img/import_colab_github.gif" width="600">
 
+## introduction slides
+
 <img src="https://raw.githubusercontent.com/napo/geospatial_bigdive/master/img/bigdive_geospatial_introduction_preview.png" width="600"><br/>
 look the [slides](docs/BigDive_geospatial_Introduction.pdf) for an introduction
 
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-Readings:
+## Readings
 * [Automating GIS-processes 2019](https://automating-gis-processes.github.io/site/)
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