Add solution structure to README.md

README.md

@@ -14,6 +14,28 @@ This solution is originally prepared to be a real-world example for the **Master
 
 **You can order the book on [Amazon](https://www.amazon.com/gp/product/B097Z2DM8Q) or on [Packt's website](https://www.packtpub.com/product/mastering-abp-framework/9781801079242).**
 
+## Solution Structure
+
+![Solution Structure](etc/images/solution-structure.png)
+
+The main solution structure of this application is like in the image above. It is mainly separated into two folders (and multiple projects under these folders) named **src** (which contains all application codes) and **test** (which contains all related tests).
+
+### src
+
+The application codes are separated into four folders: **account**, **admin**, **common** and **www**.
+
+* **account**: Contains a single project named `EventHub.IdentityServer`. It's the central identity server of the application. All applications (public web application and back-office/admin application) use this server for authentication/authorization purposes.
+
+* **admin**: Contains admin-side projects of the solution. All admin-related operations are under of these folders. UI is **Blazor WASM** for the admin side.
+
+* **common**: Contains common services and infrastructure details such as **background services**, **database migrator**, **entity framework core** etc.
+
+* **www**: Contains public website projects of the solution. All public website operations are under of these folders. UI is **MVC/Razor Pages** for the public web-side.
+
+### test
+
+Contains tests of the application codes.
+
 ## Requirements
 
 * .NET 6.0+