flexmark-java extension for defining abbreviations and turning appearance of these abbreviations in text into `<abbr>` with titles consisting of the expansion of the abbreviation

Syntax:

    This is an abbr of the abbreviation word

    *[abbr]: abbreviation

Results in:

    <p>This is an <abbr title="abbreviation">abbr</abbr> of the abbreviation word</p>

See {@link com.vladsch.flexmark.ext.abbreviation.AbbreviationExtension}