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+# Library App
+
+## Description
+
+Library App is a .NET console-based library management application. It models core library entities (books, patrons, and loans), applies business rules through application services, and uses JSON-backed repositories for persistence. The solution is organized with a clean separation between domain logic, console UI, infrastructure, and automated tests.
+
+## Project Structure
+
+- src
+  - Library.ApplicationCore
+    - Entities
+    - Enums
+    - Interfaces
+    - Services
+    - Library.ApplicationCore.csproj
+  - Library.Console
+    - Program.cs
+    - ConsoleApp.cs
+    - ConsoleState.cs
+    - CommonActions.cs
+    - appSettings.json
+    - Json
+    - Library.Console.csproj
+  - Library.Infrastructure
+    - Data
+    - Library.Infrastructure.csproj
+- tests
+  - UnitTests
+    - ApplicationCore
+    - LoanFactory.cs
+    - PatronFactory.cs
+    - UnitTests.csproj
+- README.md
+
+## Key Classes and Interfaces
+
+- Entities
+  - Author, Book, BookItem, Loan, Patron
+- Application interfaces
+  - ILoanRepository, ILoanService, IPatronRepository, IPatronService
+- Domain services
+  - LoanService, PatronService
+- Console layer
+  - ConsoleApp
+- Infrastructure data access
+  - JsonData, JsonLoanRepository, JsonPatronRepository
+
+## Usage
+
+1. Prerequisites
+   Install the .NET SDK (recommended current LTS).
+2. Restore and build
+  Command: `dotnet build src/Library.Console/Library.Console.csproj`
+3. Run the application
+  Command: `dotnet run --project src/Library.Console/Library.Console.csproj`
+4. Run unit tests
+  Command: `dotnet test tests/UnitTests/UnitTests.csproj`
+
+## License
+
+This project is licensed under the MIT License. See the repository-level LICENSE file for details.