Appends a subsequence of the specified character sequence value to this Appendable and returns this instance.
value - the character sequence from which a subsequence is appended. If value is
then characters are appended as if value contained the four characters
startIndex - the beginning (inclusive) of the subsequence to append.
endIndex - the end (exclusive) of the subsequence to append.
IndexOutOfBoundsException - or IllegalArgumentException when startIndex or endIndex is out of range of the value character sequence indices or when
startIndex > endIndex.