PostCard constructor
      
      PostCard({ 
    
    
- Key? key,
- Widget? title,
- List<Widget> ? actions,
- Widget? action,
- Widget? subheader,
- Widget? avatar,
- Widget? content,
- BoxDecoration? decoration,
- BoxConstraints? constraints,
- EdgeInsets? margin,
- dynamic avatarDecoration,
- EdgeInsets? padding,
Implementation
PostCard(
    {Key? key,
    this.title,
    this.actions,
    this.action,
    this.subheader,
    this.avatar,
    this.content,
    this.decoration,
    this.constraints,
    this.margin,
    this.avatarDecoration,
    this.padding})
    : super(key: key);