Referrals to the importance of the other sections

doc/sdk-configuration.md

 ## OpenCAPIF SDK configuration
 
+Before configuration it's needed to have completed the [prerequirements](./sdk-prerequirements.md) section and the [installation](./sdk-installation.md) section.
 ### **1. Configuration via Config.json**
 
 This configuration could also be fullfilled by enviroment variables (EXAMPLE)

doc/sdk-installation.md

 
 # OpenCAPIF SDK installation
 
+Before installation it's needed to have completed the prerequirements section.
+
 ## OpenCAPIF SDK consumer installation
 
 SOON

doc/sdk-usage.md

@@ -2,6 +2,8 @@
 
 OpenCAPIF SDK implements this set of features to easily integrate an application with CAPIF NF either manually or integrating SDK library directly within app code.
 
+Before usage it's needed to have completed the [prerequirements](./sdk-prerequirements.md) section, the [installation](./sdk-installation.md) section and the selected parts of the [configuration](./sdk-configuration.md) section.
+
 [GENERAL CAPIF USAGE FLOW](./images/Flujo%20completo-OPENCAPIF%20ACTUAL.jpg)
 
 This repository includes 2 different modes to test OpenCAPIF SDK: