title: How to create a new quantum gate and qubit initialised to a certain value
body: <p>I am trying to implement the Quantum HHL algorithm on QISKit package of IBM on Python. I have tried searching the documentation for a method to initialize a  qubit to a certain value and to create a new unitary gate with specified values. </p>
  
  <p>In the documentation, I found <a href="https://github.com/QISKit/qiskit-sdk-py/blob/master/qiskit/_gate.py" rel="nofollow noreferrer">this</a>, which is the class of a Quantum Gate. I tried to make a new instance of this class but I couldn't because not much documentation has been done about the arguments to be passed while initializing the instance of the class. </p>