Create readme.md

added folder structure tree

Author: rakesh-kumar-t

WebAPI/readme.md

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+## Business layered Heirarchy
+---
+
+#### DataAccess - Data Layer (Models and Contexts are present here)
+  - Migration commands are executed in this layer
+#### CompanyService - Service Layer (Business Logic is implemented in here)
+  - This layer uses models to access data from db
+#### WebApi - Presentation layer (Here the logic is consumed and data is fed to the UI)
+  - Controllers are present here
+  - We add reference to above two layers in this project 
+
+## Layer Structure
+
+>
+
+
+    .
+    ├── DataAccess
+    │   ├── Context
+    │   │   └── WorkDBContext.cs                   
+    │   ├── Migrations
+    │   └── Models
+    │       ├── Department.cs
+    │       └── Employee.cs
+    ├── CompanyService
+    │   ├── Interfaces
+    │   │   ├── IDepartmentService.cs
+    │   │   └── IEmployeeService.cs
+    │   └── Services 
+    │       ├── DepartmentService.cs
+    │       └── EmployeeService.cs
+    ├── WebAPI                  
+    │   ├── Controllers
+    │   │   ├── DepartmentController.cs
+    │   │   └── EmployeeController.cs
+    │   ├── Photos 
+    │   ├── Properties 
+    │   │   └── launchSettings.cs
+    │   ├── Program.cs
+    │   ├── Startup.cs      
+    │   └── appsettings.json               
+    └── ...