update README

README.md

@@ -1,11 +1,21 @@
-This is Wellspring, an immediate mode font rendering system in C.
+This is Wellspring, an immediate mode multiple-channel signed distance field font rendering system in C.
 
 About Wellspring
 ----------------
 Wellspring is inspired by the design of Dear ImGui.
-It outputs pixel data that you can upload to a texture and vertex buffers that you can render anytime in your 3D application.
+It outputs buffer data that you can upload and render anytime in your 3D application.
 This means that you can integrate it easily using the graphics library of your choice.
-Wellspring uses stb_truetype to rasterize and pack fonts quickly.
+
+Wellspring uses JSON output from [msdf-atlas-gen](https://github.com/Chlumsky/msdf-atlas-gen) to generate buffers. It also uses [stb_truetype](https://github.com/nothings/stb/blob/master/stb_truetype.h) for additional kerning support. At render time, bind the image data from msdf-atlas-gen with buffers generated by Wellspring for beautiful MSDF font rendering.
+
+Using msdf-atlas-gen
+--------------
+A full explanation of msdf-atlas-gen is beyond the scope of this project, but note that Wellspring only accepts MSDF atlas types with JSON output.
+
+Your atlas generation might look like this:
+```sh
+msdf-atlas-gen -yorigin top -font ~/mygame/myfont.otf -imageout ~/mygame/content/forgotten_dream.png -json ~/mygame/content/forgotten_dream.json
+```
 
 Dependencies
 ------------
@@ -20,7 +30,7 @@ For *nix platforms, use CMake:
 	$ cmake ../
 	$ make
 
-For Windows, see the 'visualc/' directory.
+For Windows, you can use cmake-gui to generate a Visual Studio solution or use VSCode with the CMake and C/C++ Tools extensions.
 
 License
 -------