Add README files to loading and multiplayer demos

loading/autoload/README.md

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+# Autoload Demo
+
+This demo shows how to use autoloads to change between scenes.
+
+Language: GDScript
+
+Renderer: GLES 2

loading/background_load/README.md

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+# Background Load
+
+This is a demo showing how to use the `load_interactive()` method of
+[`ResourceLoader`](https://docs.godotengine.org/en/latest/classes/class_resourceloader.html)
+to load large scenes in the background with a progress bar.
+
+Language: GDScript
+
+Renderer: GLES 2
+
+## Screenshots
+
+![Screenshot](screenshots/paintings.png)

loading/scene_changer/README.md

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+# Scene Changer
+
+This uses functions in SceneTree to switch between two scenes.
+
+Language: GDScript
+
+Renderer: GLES 2

loading/threads/README.md

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+# Loading with Threads
+
+An example using a thread to load an image. 
+
+Language: GDScript
+
+Renderer: GLES 2
+
+## Screenshots
+
+![Screenshot](screenshots/load_in_thread.png)

networking/multiplayer_bomber/README.md

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+# Multiplayer Bomber
+
+A multiplayer implementation of the classical bomberman game.
+One of the players should press "host", while the other
+should type in his address and press "play". 
+
+Language: GDScript
+
+Renderer: GLES 2
+
+## Screenshots
+
+![Screenshot](screenshots/bomber.png)

networking/multiplayer_pong/README.md

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+# Pong Multiplayer
+
+A multiplayer demo of the classical pong game.
+One of the players should press "host", while the other should select the address and press "join". 
+
+Language: GDScript
+
+Renderer: GLES 2
+
+Note: The non-multiplayer version is available [here](https://github.com/godotengine/godot-demo-projects/tree/master/2d/pong).
+
+## Screenshots
+
+![Screenshot](screenshots/pong_multiplayer.png)