Initial commit

srcs/RobotNet10/Shared/RobotNet10.Shared/Geometry/Quaternion.cs

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+namespace RobotNet10.Shared.Geometry;
+
+/// <summary>
+/// Quaternion message (geometry_msgs/Quaternion)
+/// Represents a rotation in free space in quaternion form
+/// </summary>
+public struct Quaternion
+{
+    /// <summary>
+    /// X component
+    /// </summary>
+    public double X { get; set; }
+
+    /// <summary>
+    /// Y component
+    /// </summary>
+    public double Y { get; set; }
+
+    /// <summary>
+    /// Z component
+    /// </summary>
+    public double Z { get; set; }
+
+    /// <summary>
+    /// W component (scalar part)
+    /// </summary>
+    public double W { get; set; }
+
+    /// <summary>
+    /// Default constructor
+    /// </summary>
+    public Quaternion()
+    {
+        X = 0.0;
+        Y = 0.0;
+        Z = 0.0;
+        W = 1.0; // Identity quaternion
+    }
+
+    /// <summary>
+    /// Constructor with parameters
+    /// </summary>
+    public Quaternion(double x, double y, double z, double w)
+    {
+        X = x;
+        Y = y;
+        Z = z;
+        W = w;
+    }
+}
+