To add a new font library, it should be in this defined format-
* struct _FONT_ {
 *     uint16_t   font_Size_in_Bytes_over_all_included_Size_it_self;
 *     uint8_t    font_Width_in_Pixel_for_fixed_drawing;
 *     uint8_t    font_Height_in_Pixel_for_all_characters;
 *     unit8_t    font_First_Char;
 *     uint8_t    font_Char_Count;
 *
 *     uint8_t    font_Char_Widths[font_Last_Char - font_First_Char +1];
 *                  // for each character the separate width in pixels,
 *                  // characters < 128 have an implicit virtual right empty row
 *
 *     uint8_t    font_data[];
 *                  // bit field of all characters}
after creating the font library, it can be added to LedP10 library by assigning the font library pointer to font_lib field of the class in all four basic function provided.