Add C# examples to Creating your first script (#5991)

Co-authored-by: Hugo Locurcio <hugo.locurcio@hugo.pro>

getting_started/step_by_step/scripting_first_script.rst

@@ -21,12 +21,15 @@ Creating your first script
 In this lesson, you will code your first script to make the Godot icon turn in
 circles using GDScript. As we mentioned :ref:`in the introduction
 <toc-learn-introduction>`, we assume you have programming foundations.
+The equivalent C# code has been included in another tab for convenience.
 
 .. image:: img/scripting_first_script_rotating_godot.gif
 
 .. seealso:: To learn more about GDScript, its keywords, and its syntax, head to
              the :ref:`GDScript reference<doc_gdscript>`.
 
+.. seealso:: To learn more about C#, head to the :ref:`C# basics <doc_c_sharp>` page.
+
 Project setup
 -------------
 
@@ -91,6 +94,25 @@ following line of code:
 
     extends Sprite
 
+ .. code-tab:: csharp C#
+
+    public class Sprite : Godot.Sprite
+    // Declare member variables here. Examples:
+    // private int a = 2;
+    // private string b = "text";
+
+    // Called when the node enters the scene tree for the first time.
+    public override void _Ready()
+    {
+
+    }
+
+    //  // Called every frame. 'delta' is the elapsed time since the previous frame.
+    //  public override void _Process(float delta)
+    //  {
+    //
+    //  }
+
 Every GDScript file is implicitly a class. The ``extends`` keyword defines the
 class this script inherits or extends. In this case, it's ``Sprite``, meaning
 our script will get access to all the properties and functions of the Sprite
@@ -127,6 +149,14 @@ Add the following code to your script:
     func _init():
         print("Hello, world!")
 
+ .. code-tab:: csharp C#
+
+    public Sprite()
+    {
+        GD.Print("Hello, world!");
+    }
+
+
 Let's break it down. The ``func`` keyword defines a new function named
 ``_init``. This is a special name for our class's constructor. The engine calls
 ``_init()`` on every object or node upon creating it in memory, if you define
@@ -158,6 +188,11 @@ angular speed in radians per second.
     var speed = 400
     var angular_speed = PI
 
+ .. code-tab:: csharp C#
+
+    private int Speed = 400;
+    private float AngularSpeed = Mathf.Pi;
+
 Member variables sit near the top of the script, after any "extends" lines,
 but before functions. Every node
 instance with this script attached to it will have its own copy of the ``speed``
@@ -194,6 +229,13 @@ At the bottom of the script, define the function:
     func _process(delta):
         rotation += angular_speed * delta
 
+ .. code-tab:: csharp C#
+
+    public override void _Process(float delta)
+    {
+        Rotation += AngularSpeed * delta;
+    }
+
 The ``func`` keyword defines a new function. After it, we have to write the
 function's name and arguments it takes in parentheses. A colon ends the
 definition, and the indented blocks that follow are the function's content or
@@ -231,6 +273,12 @@ them.
 
     position += velocity * delta
 
+ .. code-tab:: csharp C#
+
+    var velocity = Vector2.Up.Rotated(Rotation) * Speed;
+
+    Position += velocity * delta;
+
 As we already saw, the ``var`` keyword defines a new variable. If you put it at
 the top of the script, it defines a property of the class. Inside a function, it
 defines a local variable: it only exists within the function's scope.
@@ -277,3 +325,22 @@ Here is the complete ``Sprite.gd`` file for reference.
         var velocity = Vector2.UP.rotated(rotation) * speed
 
         position += velocity * delta
+
+ .. code-tab:: csharp C#
+
+    using Godot;
+
+    public class Sprite : Godot.Sprite
+    {
+        private int Speed = 400;
+        private float AngularSpeed = Mathf.Pi;
+
+        public override void _Process(float delta)
+        {
+            Rotation += AngularSpeed * delta;
+            var velocity = Vector2.Up.Rotated(Rotation) * Speed;
+
+            Position += velocity * delta;
+
+        }
+    }