title: Display math formulas with iosMath using swift 3
body: <p>I am very new to app development, especially in iOS using Swift 3. For now, I want to display math formulas with swift using "iosMath". 
  I followed the steps from this "<a href="https://stackoverflow.com/questions/44228429/using-iosmath-in-swift">Using iosMath in Swift</a>" 
  but I do not know what he means by creating a bridging header and don't know how to use iosMath in my code. For example, I want to enter a number and in the next line, the program shows the square root of the entered number. Here's an example of what I want to do:</p>
  
  <pre><code>import UIKit
  import iosMath
  
  class ViewController: UIViewController {
  
      @IBOutlet weak var numberField: UITextField!
      @IBOutlet weak var resultLabel: UILabel!
  
      @IBAction func computeTapped(_ sender: Any) {
          guard let numberValue = numberField.text else {
              return
          }
  
          let result = numberValue
  
          resultLabel.text = "The Square root of \(result) is \(result)"
          resultLabel.isHidden = false        
      }
  }
  </code></pre>
  
  <p>Hope you can help me :) 
  Thanks in advance!</p>