Add tags to all demo projects

This makes sorting them in the project manager easier, as you can
click tags in the project manager to filter to a specific tag.

mono/2.5d/project.godot

@@ -16,6 +16,7 @@ in Godot by mixing 2D and 3D nodes. It also adds a
 2.5D editor viewport for easily editing 2.5D levels."
 run/main_scene="res://assets/demo_scene.tscn"
 config/icon="res://icon.webp"
+config/tags=PackedStringArray("demo", "official", "2d")
 
 [display]
 

mono/android_iap/project.godot

@@ -16,6 +16,7 @@ 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.webp"
+config/tags=PackedStringArray("demo", "official", "mobile", "porting")
 
 [display]
 

mono/dodge_the_creeps/project.godot

@@ -19,6 +19,7 @@ tutorial in the documentation, but ported to C#. For more details,
 consider following the tutorial in the documentation."
 run/main_scene="res://Main.tscn"
 config/icon="res://icon.webp"
+config/tags=PackedStringArray("demo", "official", "2d")
 
 [display]
 

mono/multiplayer_pong/project.godot

@@ -16,6 +16,7 @@ One of the players should press 'host', while the
 other should select the address and press 'join'."
 run/main_scene="res://lobby.tscn"
 config/icon="res://icon.webp"
+config/tags=PackedStringArray("demo", "official", "2d", "network")
 
 [display]
 

mono/pong/project.godot

@@ -15,6 +15,7 @@ config/description="A simple Pong game. This demo shows best practices
 for game development in Godot, including signals."
 run/main_scene="pong.tscn"
 config/icon="res://icon.webp"
+config/tags=PackedStringArray("demo", "official", "2d")
 
 [display]