Add architecture flow documentation

.gitignore

@@ -0,0 +1,13 @@
+# Ignore build outputs
+bin/
+obj/
+*.user
+*.db
+*.db-shm
+*.db-wal
+Todo.Tests/bin/
+Todo.Tests/obj/
+# Ignore VS folder
+.vs/
+# ignore local environment files
+app.db*

README.md

@@ -29,3 +29,6 @@ git clone https://github.com/Romulo-Queiroz/todoListFront
 | :-------------------------------------------------------------------------------------------------------------------------------------: |
 
 </div>
+
+## Architecture Diagram
+See [docs/architecture.md](docs/architecture.md) for a high level flow of how the API handles requests.

docs/architecture.md

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+# Project Flow
+
+The diagram below summarizes how requests are processed in the Task Manager API.
+
+```mermaid
+flowchart TD
+    Client((Client)) -->|HTTP request| Controller[Controllers]
+    Controller --> Service[Services]
+    Service --> Dal[DAL]
+    Dal --> Db[(Database)]
+    Service -->|Returns data| Controller
+    Controller -->|JSON| Client
+```
+
+Each layer has a specific responsibility:
+
+- **Controllers** handle HTTP requests and responses.
+- **Services** contain business logic.
+- **DAL (Data Access Layer)** interacts with the database via Entity Framework Core.
+- **Database** stores tasks, categories, and users.
+
+Use this diagram to explain the flow of information through the application.