adding teleportation example demonstrating if stmt

#include <qalloc>

__qpu__ void teleport(qreg q) {

  // State preparation (Bob)

  X(q[0]);

  // Bell channel setup

  H(q[1]);

  CX(q[1], q[2]);

  // Alice Bell measurement

  CX(q[0], q[1]);

  H(q[0]);

  Measure(q[0]);

  Measure(q[1]);

  // Correction

  if (q[0]) {

    Z(q[2]);

  }

  if (q[1]) {

    X(q[2]);

  }

  // Measure teleported qubit

  Measure(q[2]);

}

int main() {

    // Allocate the qubits

    auto q = qalloc(3);

    // run the teleportation

    teleport(q);

    // dump the results

    q.print();

}

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