📝 Add technical stack description to the README

README.md

@@ -1,8 +1,18 @@
-# Carrramba-encore-rate
-# 🚧 Carrramba-encore-rate 🚧
 
+Resident of the Ile-de-France,
+
+- Tired of missing your bus/train/metro ?
+- Tired of having to walk to know where your bus/train/metro will stop ?
+- Are you looking to display its next passages in the same way as Ile De France Mobilité ?
+
+**Visit [carrramba.adrien.run](https://carrramba.adrien.run/)**
 
 [![Presentation](medias/presentation.png)](medias/presentation.mp4)
+
+# Technical stack
+
+The following figure list the building blocks (docker images) and their interactions to provide the service:
+
 ```plantuml
 @startuml
 !include <C4/C4_Container>
@@ -23,7 +33,7 @@ Person(user, "User", "The service user", $sprite="users")
 
 System_Boundary(cb1, "carrramba-encore-rate") {
   Container(app, "SPA", "SolidJS", "The graphical interface used by users to consume services provided")
-  Container(api, "carrramba-encore-rate-api", "FastAPI / SQLAlchemy", "Provides the functionalities serving API endpoints", $sprite="sqlalchemy")
+  Container(api, "carrramba-encore-rate-api", "FastAPI / Pydantic 2 / SQLAlchemy 2", "Provides the functionalities serving API endpoints", $sprite="sqlalchemy")
   ContainerDb(db, "Postgres", "PostgreSQL database", "Stores stops/stop areas/lines/shapes and associations information.", $sprite="postgresql")
   ContainerDb(cache, "In-Memory cache", "Redis", "Store previously computed results (stop, line, destination, next passages, shapes).", $sprite="redis")
 
@@ -47,3 +57,57 @@ Rel_L(db_updater, db, "Writes to", "sync, PSQL")
 Rel(db_updater, static_, "Get stops, lines andshapes")
 @enduml
 ```
+
+## Back-end
+
+Conventional but efficient:
+
+- [FastAPI](https://fastapi.tiangolo.com/): _FastAPI is a modern, fast (high-performance), web framework for building
+   APIs with Python 3.8+ based on standard Python type hints._
+- [Pydantic 2](https://docs.pydantic.dev/latest/): _Pydantic is the most widely used data validation library for
+   Python._
+- [Sqlalchemy 2](https://www.sqlalchemy.org/): _SQLAlchemy is the Python SQL toolkit and Object Relational Mapper that
+   gives application developers the full power and flexibility of SQL._
+
+The [Msgspec](https://github.com/jcrist/msgspec) library is used to serialize JSON objects collected from IDFM API
+endpoints, this library being faster than Pydantic.
+
+## Front-end
+
+The component is developed using the [SolidJS](https://www.solidjs.com/) library. It brings the following interesting specificities:
+
+- Share with React the same programmatic structures and support for component.
+- Fine-grained reactivity architecture: no virtual DOM used to update the components, the browser DOM is directly
+  updated by SolidJS.
+
+The front-end tries to be as close as possible to the design defined by the IDFM for the displays deployed by the
+transport operators in Ile-de-France. These specifications are public and available here:
+[PRIM-IDFM](https://prim.iledefrance-mobilites.fr/en/chartes-et-prescriptions).
+
+
+# TODO
+
+## Features
+
+- [ ] Integration with [Matrix.org](https://matrix.org/ecosystem/integrations/) ecosystem: make the app able to send message to a room when a bus/train/metro will
+      arriving in X minutes.
+- [ ] Add the capability for the users to pin his/her favorite stops.
+- [ ] Add the address to the stop location.
+
+## Front-end
+
+- [ ] Add unit tests.
+- [ ] Make the StopNameInput component liquid.
+- [ ] Liquid to responsive Design.
+
+## Back-end
+
+- [ ] Add unit tests.
+- [ ] Use [alembic](https://alembic.sqlalchemy.org/en/latest/) to manage the future updates of the database schemas.
+- [ ] Add the capability to reload the application configuration on configuration file update (e.g.: credential update by the vault).
+- [ ] Rework how the database is updated with the IDFM data: For now the database is cleaned before refilling. It could
+      be useful to avoid to empty the database and only apply deltas (update/add/remove rows).
+- [ ] Could be nice to compare FastAPI with [Litestar](https://litestar.dev/).
+
+<!--  LocalWords:  specificities
+ -->