update README

README.md

 # CTAO ESAP SDC Portal
 
-Development of a portal for the CTAO Science Data Challenge (SDC), based on ESAP GUI Gateway.
+Development of a portal for the CTAO Science Data Challenge (SDC), based on ESAP GUI Gateway (started as a fork).
 
 ## Architecture
 
@@ -9,7 +9,16 @@ Django web project based on ESAP API and its collection of applications, with th
 ## Development Guidelines
 
 * The ESAP API applications should remain similar to the upstream versions, so as to keep up to date with the latest ESAP API developments.
-* 
+* The sdc_portal application should contain all pages dedicated to the SDC portal, and connect to the ESAP API for internal processing when necessary.
+* The branch from_uptream contains the main branch of the upstream project ESAP API Gateway, so as to merge future ESAP developments.
+* The main branch should only receive pull requests for the SDC Portal development.
+* Commits should be pushed to development branches dedicated to a feature or modification.
+
+## Installation for development
+
+See ESAP API dev mode:
+https://git.astron.nl/astron-sdc/escape-wp5/esap-api-gateway/-/wikis/Build-&-Deploy/Development-mode-(localhost)
+