Add tests to Read aloud for MathML

MathML is well supported across reading systems now, it can be included in the regular test books. In Read aloud it could be inserted at the end of the existing tests.

Proposed test:

The math expressions below are in MathML format. Check if the read aloud feature announces the MathML expressions both inline and between the paragraphs. Check the MathML expressions are read correctly.

Indicate Pass or Fail.

*** Here we would have a passage with inline and block MathML ***

Start by locating the existing Read aloud test book and its regular test cases in the repository. Add a passage containing inline and block MathML at the end, then run the Read aloud tests and record whether both forms are announced and read correctly with Pass or Fail.

Written by the indexing model from the issue text.