Add C# code examples on Listening to player input (#6009)

getting_started/step_by_step/scripting_player_input.rst

@@ -42,6 +42,20 @@ code below.
 
     rotation += angular_speed * direction * delta
 
+ .. code-tab:: csharp C#
+
+    var direction = 0;
+    if (Input.IsActionPressed("ui_left"))
+    {
+        direction = -1;
+    }
+    if (Input.IsActionPressed("ui_right"))
+    {
+        direction = 1;
+    }
+
+    Rotation += AngularSpeed * direction * delta;
+
 Our ``direction`` local variable is a multiplier representing the direction in
 which the player wants to turn. A value of ``0`` means the player isn't pressing
 the left or the right arrow key. A value of ``1`` means the player wants to turn
@@ -75,12 +89,20 @@ To only move when pressing a key, we need to modify the code that calculates the
 velocity. Replace the line starting with ``var velocity`` with the code below.
 
 .. tabs::
-   .. code-tab:: gdscript GDScript
+ .. code-tab:: gdscript GDScript
 
     var velocity = Vector2.ZERO
     if Input.is_action_pressed("ui_up"):
         velocity = Vector2.UP.rotated(rotation) * speed
 
+ .. code-tab:: csharp C#
+
+    var velocity = Vector2.Zero;
+    if (Input.IsActionPressed("ui_up"))
+    {
+        velocity = Vector2.Up.Rotated(Rotation) * Speed;
+    }
+
 We initialize the ``velocity`` with a value of ``Vector2.ZERO``, another
 constant of the built-in ``Vector`` type representing a 2D vector of length 0.
 
@@ -116,6 +138,39 @@ Here is the complete ``Sprite.gd`` file for reference.
 
         position += velocity * delta
 
+ .. code-tab:: csharp C#
+
+    using Godot;
+
+    public class Sprite : Godot.Sprite
+    {
+        private float Speed = 400;
+        private float AngularSpeed = Mathf.Pi;
+
+        public override void _Process(float delta)
+        {
+            var direction = 0;
+            if (Input.IsActionPressed("ui_left"))
+            {
+                direction = -1;
+            }
+            if (Input.IsActionPressed("ui_right"))
+            {
+                direction = 1;
+            }
+
+            Rotation += AngularSpeed * direction * delta;
+
+            var velocity = Vector2.Zero;
+            if (Input.IsActionPressed("ui_up"))
+            {
+                velocity = Vector2.Up.Rotated(Rotation) * Speed;
+            }
+
+            Position += velocity * delta;
+        }
+    }
+
 If you run the scene, you should now be able to rotate with the left and right
 arrow keys and move forward by pressing :kbd:`Up`.