restructure docs for 1-3 chapter

Author: Floyd Huizinga

docs/1-introduction/1-3-basics/1-3-0-overview.md

@@ -0,0 +1,21 @@
+# Overview
+
+Now that we know how to get a triangle on screen, we'll dive into the more simple topics in rendering.
+
+We'll talk about the rasterizer state and what it can do for us, get some textures onto our geometry, and explain everything we need to get a 3D model properly rendering.
+
+Finally we'll add a tool that almost everyone uses, "Dear ImGui" which allows is to very flexibly add some UI to control things in our scenes.
+
+[Rasterizer State](1-3-1-rasterizer-state.md)
+
+[Texturing](1-3-2-texturing.md)
+
+[Setting up 3D Rendering](1-3-3-setting-up-3d-rendering.md)
+
+[3D Rendering](1-3-4-3d-rendering.md)
+
+[Models](1-3-5-models.md)
+
+[Dear ImGui](1-3-6-dear-imgui.md)
+
+[Next chapter](./1-3-2-texturing.md)

docs/1-introduction/1-3-basics/1-3-6-dear-imgui.md

@@ -0,0 +1 @@
+# Dear ImGui