Ensure most demos have descriptions and screenshots

mono/android_iap/project.godot

@@ -11,6 +11,9 @@ config_version=4
 [application]
 
 config/name="Android in-app purchases with C#"
+config/description="This demo shows how to make in-app payments in Android in C#.
+
+Note: Running the demo requires exporting and uploading the game to Google Play."
 run/main_scene="res://main.tscn"
 config/icon="res://icon.png"
 

mono/dodge_the_creeps/README.md

@@ -22,6 +22,8 @@ Check out this demo on the asset library: https://godotengine.org/asset-library/
 
 ![GIF from the documentation](https://docs.godotengine.org/en/latest/_images/dodge_preview.gif)
 
+![Screenshot](screenshots/dodge.png)
+
 ## Copying
 
 `art/House In a Forest Loop.ogg` Copyright © 2012 [HorrorPen](https://opengameart.org/users/horrorpen), [CC-BY 3.0: Attribution](http://creativecommons.org/licenses/by/3.0/). Source: https://opengameart.org/content/loop-house-in-a-forest

mono/multiplayer_pong/README.md

@@ -13,4 +13,4 @@ Check out this demo on the asset library: https://godotengine.org/asset-library/
 
 ## Screenshots
 
-![Screenshot](../../2d/pong/screenshots/pong.png)
+![Screenshot](screenshots/pong_multiplayer.png)

mono/multiplayer_pong/project.godot

@@ -48,6 +48,7 @@ move_up={
 [rendering]
 
 quality/driver/driver_name="GLES2"
-quality/2d/use_pixel_snap=true
+2d/snapping/use_gpu_pixel_snap=true
 vram_compression/import_etc=true
 vram_compression/import_etc2=false
+quality/2d/use_pixel_snap=true

mono/pong/README.md

@@ -25,4 +25,4 @@ they emit signals and modify the ball.
 
 ## Screenshots
 
-![Screenshot](../../2d/pong/screenshots/pong.png)
+![Screenshot](screenshots/pong.png)