Add a list of supported HTML elements by Label's HtmlFormat property

[pavi2410]

The following HTML elements are supported:

    Bold: <b>, <em>
    Italic: <i>, <cite>, <dfn>
    25% larger text: <big>
    20% smaller text: <small>
    Setting font properties: <font face=”font_family“ color=”hex_color”>. Examples of possible font families include monospace, serif, and sans_serif.
    Setting a monospace font family: <tt>
    Strikethrough: <s>, <strike>, <del>
    Underline: <u>
    Superscript: <sup>
    Subscript: <sub>
    Bullet points: <ul>, <li>
    Line breaks: <br>
    Division: <div>
    CSS style: <span style=”color|background_color|text-decoration”>
    Paragraphs: <p dir=”rtl | ltr” style=”…”>

Taken from https://developer.android.com/guide/topics/resources/string-resource#StylingWithHTML