Add OpenModelica integration script with simulation and result extraction

ProjectileMotion.mo

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+model ProjectileMotion
+  "Simple projectile motion model for testing"
+
+  // Parameters
+  parameter Real v0 = 20.0 "Initial velocity (m/s)";
+  parameter Real angle = 45.0 "Launch angle (degrees)";
+  parameter Real g = 9.81 "Gravitational acceleration (m/s^2)";
+  parameter Real m = 1.0 "Mass (kg)";
+
+  // State variables
+  Real x(start = 0.0) "Horizontal position (m)";
+  Real y(start = 0.0) "Vertical position (m)";
+  Real vx(start = v0 * cos(angle * 3.14159265359 / 180.0)) "Horizontal velocity (m/s)";
+  Real vy(start = v0 * sin(angle * 3.14159265359 / 180.0)) "Vertical velocity (m/s)";
+
+equation
+  // Equations of motion
+  der(x) = vx;
+  der(y) = vy;
+  der(vx) = 0;  // No horizontal acceleration
+  der(vy) = -g; // Gravitational acceleration downward
+
+end ProjectileMotion;