title: How to define custom text theme in flutter?
body: <p>How to make my own text theme style?
  I only find the default text theme like this but it's not enough.</p>
  
  <pre><code>textTheme: TextTheme(
    body1: TextStyle(),
    body2: TextStyle(),
    button: TextStyle(),
    caption: TextStyle(),
    display1: TextStyle(),
    display2: TextStyle(),
    display3: TextStyle(),
    display4: TextStyle(),
    headline: TextStyle(),
    overline: TextStyle(),
    subhead: TextStyle(),
    subtitle: TextStyle(),
    title: TextStyle(),
  ),
  </code></pre>
  
  <p>I want for example have a text with line through then some other have underline etc
  I was thinking to override the <code>body2</code> for underline style then how to define another style for line through?</p>
  
  <p>Kind Regards</p>