title: Find the mid time value between two time values using momentjs
body: <p>Assume I have two time values as <code>startTime</code> and <code>endTime</code>.
  I want to find the exact mid value of this time objects.
  Example: if startTime is <code>10:30</code> and endTime is <code>11:30</code>, I need <code>11:00</code> as the midpoint value.</p>
  <p>How to solve this using momentjs in JavaScript?</p>