Add README files to Viewport demos

viewport/dynamic_split_screen/README.md

@@ -1,24 +1,49 @@
-# The project
-This sample project showcases an implementation of dynamic split screen, also called Voronoi split screen, using the [Godot engine](https://godotengine.org).
+# Dynamic Split Screen
 
-# Dynamic split screen
-A dynamic split screen system displays a single screen when the two players are close but a splitted view when they move apart.
+This sample project showcases an implementation of dynamic
+split screen, also called Voronoi split screen.
 
-The splitting line can take any angle depending on the players' position, so it won't be either vertical or horizontal.
+Language: [GDSL](https://docs.godotengine.org/en/latest/tutorials/shading/shading_reference/shading_language.html) and GDScript
+
+Renderer: GLES 2
+
+Note: An HTML5 export is testable
+[here](https://benjaminnavarro.github.io/godot_dynamic_split_screen/index.html).
+
+## Details
+
+A dynamic split screen system displays a single screen when
+the two players are close but a splitted view when they move apart.
+
+The splitting line can take any angle depending on the players'
+position, so it won't be either vertical or horizontal.
 
 This system was popularized by the Lego videogames.
 
-# How it works
-Two cameras are placed inside two separate viewports and their texture, as well as some other parameters, are passed to a shader attached to a TextureRect filling the whole screen.
+## How it works
 
-The `SplitScreen` shader, with the help of the `CameraController` script, chooses wich texture to display on each pixel to achieve the effect.
+Two cameras are placed inside two separate viewports and their
+texture, as well as some other parameters, are passed to a
+shader attached to a TextureRect filling the whole screen.
 
-The cameras are placed on the segment joining the two players, either in the middle if they're close enough or at a fixed distance otherwise. 
+The `SplitScreen` shader, with the help of the `CameraController`
+script, chooses wich texture to display on each pixel to
+achieve the effect.
 
-# How to use it
-Open and launch the project inside the Godot engine and then you can use WASD keys to move the first player and IJKL keys to move the second one.
+The cameras are placed on the segment joining the two players,
+either in the middle if they're close enough or at a fixed
+distance otherwise. 
 
-The `Cameras` node has parameters to tune the distance at which the screen splits and also the width and color of the splitting line.
+## How to use it
 
-# Try it out
-An HTML5 export is testable [here](https://benjaminnavarro.github.io/godot_dynamic_split_screen/index.html).
+Open and launch the project inside the Godot engine and then
+you can use WASD keys to move the first player and IJKL keys
+to move the second one.
+
+The `Cameras` node has parameters to tune the distance at
+which the screen splits and also the width and color of
+the splitting line.
+
+## Screenshots
+
+![Screenshots](screenshots/splitscreen.png)