Added Russian phonetic ABNT2

Created a Russian phonetic variant for ABNT2 Brazilian standard keyboards. Here are the changes comparing to the regular phonetic:

• Everything on the number row is completely unchanged from the ABNT2
• All of the slashes, dots, commas, etc... are also unchanged from the ABNT2
• "Q" writes "Ь", "AlgGr + Q" writes "Ъ"
• "X" writes "Ш" and "AltGR + X" writes "Щ" (this is because in Portuguese, the letter "X" has a "sh" sound, so it makes more sense to us phonetically)
• "Ç" writes "Ч"
• "W" writes "ж"
• "AltGR + E" writes "э"
• "AltGR + U" writes "Ю"
• "AltGR + A" writes "Я"
• "AltGR + O" writes "Ё"