Added thumbnails

Author: britzl

animation/basic_tween/basic_tween_thumb.png

@@ -4,6 +4,7 @@ title: Bunnymark
 brief: This is a performance test for sprites
 author: Defold Foundation
 scripts: bunnymark.script
+thumbnail: bunnymark_thumb.png
 ---
 
 The example spawns game objects and animates them using go.animate(). An alternative bunnymark test with more options can be found [here](https://github.com/britzl/defold-bunnymark).

sprite/bunnymark/bunnymark_thumb.png

@@ -4,6 +4,7 @@ title: Change sprite image
 brief: This example shows how to change the image of a sprite
 author: Defold Foundation
 scripts: changeimage.script
+thumbnail: changeimage_thumb.png
 ---
 
 The example shows a game object with a sprite and a script with three script properties to reference different tilesource images. The script lets the user change which image to use on the sprite.

sprite/bunnymark/example.md

@@ -4,6 +4,7 @@ title: Flip
 brief: This example demonstrates flipping a sprite animation vertically and horizontally.
 author: FlexYourBrain
 scripts: flip.script
+thumbnail: flip_thumb.png
 ---
 
 Overview :  [sprite.set_hflip](https://defold.com/ref/beta/sprite/#sprite.set_hflip:url-flip) & [sprite.set_vflip](https://defold.com/ref/beta/sprite/#sprite.set_vflip:url-flip) uses a boolean to set if a sprite animation should be flipped.

sprite/changeimage/changeimage_thumb.png

@@ -4,6 +4,7 @@ title: Multiple Sprite Samplers
 brief: This example shows how to sample from more than one image when drawing a sprite
 author: Defold Foundation
 scripts: multi_sample.script, multi_sample_sprite.fp
+thumbnail: samplers_thumb.png
 ---
 
 The example uses a sprite with a material with two samplers:

sprite/changeimage/example.md

@@ -4,6 +4,7 @@ title: Sprite size
 brief: This example shows how to get the size of a sprite at run-time
 author: Defold Foundation
 scripts: size.script
+thumbnail: size_thumb.png
 ---
 
 The example uses two game objects, each with a sprite component and a label (to show the size). One of game objects contains the script that reads the size and shows it on the labels: