Added document: Todo/Overall.md

docs/en/Tutorials/Todo/Overall.md

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+# Quick Start: Overall
+
+**Welcome to the ABP Framework**. This is a single-part, quick-start tutorial to build a simple application. Start with this tutorial if you want to quickly understand how ABP Framework works.
+
+## Select the Solution Architecture
+
+This tutorial has multiple versions. Please select the one best fits for you:
+
+* **[Single-Layer Solution](Single-Layer/Index.md)**: Creates a single-project solution. Recommended for building an application with a **simpler and easy to understand** architecture.
+* **[Layered Solution Architecture](Index.md)**: A fully layered (multiple projects) solution based on [Domain Driven Design](../../Domain-Driven-Design.md) practices. Recommended for long-term projects that need a **maintainable and extensible** codebase.
+
+## See Also
+
+* Check the [Web Application Development Tutorial](../../Part-1.md) to see a real-life web application development in a layered architecture.

docs/en/docs-nav.json

@@ -2,7 +2,17 @@
   "items": [
     {
       "text": "Quick Start",
-      "path": "Tutorials/Todo/Index.md"
+      "path": "Tutorials/Todo/Overall.md",
+      "items": [
+        {
+          "text": "With single-layer solution",
+          "path": "Tutorials/Todo/Single-Layer/Index.md"
+        },
+        {
+          "text": "With layered architecture",
+          "path": "Tutorials/Todo/Index.md"
+        }
+      ]
     },
     {
       "text": "Getting Started",