fix readme

README.md

@@ -4,10 +4,33 @@
 ## Development branches
 
 backend
-: RESTful (Level 2, JSON over RPC) API using Rust-lang (and probably (actix web framework)[https://actix.rs] plus (utoipa\[sic! 🍺 beer-branded punny name\])[https://github.com/juhaku/utoipa]
+: Server component, using Rust/SQL, offering API (via HTTP/2?)
 
 db_scripts
-: Database connection using Rust-lang and SQLx
+: SQL scripts
 
 main
 : frontend client as flutter app
+
+
+
+## Tech used
+
+### Backend
+
+- Database connection using Rust-lang and SQLx
+
+- RESTful (Level 2, JSON over RPC) API using Rust-lang (and probably (actix web framework)[https://actix.rs] plus (utoipa\[sic! 🍺 beer-branded punny name\])[https://github.com/juhaku/utoipa]
+
+## Frontend
+
+- Google Flutter using Dart.
+
+Target platforms?
+
+- probably Android[^1], iOS[^2].
+- Debug target could be desktop for fastest deployment. Production targets: Perhaps desktop and/or web, if wanted.
+
+
+[1]: via APK? Via Play Store or F-Droid? Then Registration as Play store developer (for charity or one time purchase with credit card?) needed.
+[2]: Registration as Apple developer for charity needed.