Add steps processing docs to readme

README.md

@@ -60,9 +60,8 @@ At this point, (reduced) image data can be loaded and visualized on GIS tools.
 For instance, MEEO/ADAM platform (eventualy, we will put them public for download).
 
 > GeoTIFF is one of the file formats data is archived at this level. 
-> Other file format is ISIS cubes, used internally for further processing (products)
-> 
-> * Science-ready products are publishable
+> Other file format is ISIS cubes, used internally for further processing (products).
+> Science-ready products are publishable
 
 Final _Processing_ make use of _reduced_ data, fundamentaly, Planetary services offer
 users the reduced data base for selection and further processing 
@@ -77,10 +76,21 @@ Direct download from GeoTIFF products or access through OGC services.
 **Figure-1:** overall data processing workflow.
 Pre-processing format and adjust data for Services data processing, where mosaicking,
 and further analysis tools can be applied.
-A post-processing step is considered to particular formating for final products
-publication (_e.g._, EPSG:4326 for OGC Services publishing)
+A post-processing step is considered to particular formating or annotation for final 
+products publication (_e.g._, project EPSG:4326 for OGC Services publishing).
 ![workflow](assets/workflow.jpg)
 
+## Documentation
+
+Each of the processing blocks and data structure previously introduced are further
+discussed in the following documents:
+
+* Search/Download: [Data Source](01_data_source.md)
+* Pre-processing: [Data Reduction](02_data_reduction.md)
+* Processing: [Data Products](03_data_production.md)
+* Post-processing: [Data Publication](04_data_publication.md)
+
+
 - - - 
 Metadata (DB):