Okay.
Step 1. Download the file and then open the archive and there is a folder in there named Ford Focus SVT [2.2.8] double click on it and then select data and export and drag them or extract them into City Car Driving folder.
Step 2. Go to CityCarDriving\Data\Config and look for player_cars.xml open it with notepad or notepad ++ go down and copy
<Car Name="focussvt" ABS="true" AT="true" >
<DisplayName>Ford Focus SVT</DisplayName>
<Description>
Ford Focus SVT (ïåðâîå ïîêîëåíèå)
Òèï ïðèâîäà: ïåðåäíèé
Òèï êîðîáêè ïåðåäà÷ è êîë-âî ïåðåäà÷: ÌÊÏÏ - 6, ÀÊÏÏ - 4
Äâèãàòåëü: 2.0 T Duratec-RS, 215 ë.ñ. íà 5500 îá/ìèí
Ðàáî÷èé îáú¸ì äâèãàòåëÿ: 1988 êóá.ñì.
Ìàêñèìàëüíàÿ ñêîðîñòü: ÌÊÏÏ - 232 êì/÷, ÀÊÏÏ - 200 êì/÷
Âðåìÿ ðàçãîíà (0-100 êì/÷), ñ: 6.4
</Description>
this right before this line </Cars> it should look like this
<!-- ADD NEW CARS BELOW THIS LINE -->
<Car Name="focussvt" ABS="true" AT="true" >
<DisplayName>Ford Focus SVT</DisplayName>
<Description>
Ford Focus SVT (ïåðâîå ïîêîëåíèå)
Òèï ïðèâîäà: ïåðåäíèé
Òèï êîðîáêè ïåðåäà÷ è êîë-âî ïåðåäà÷: ÌÊÏÏ - 6, ÀÊÏÏ - 4
Äâèãàòåëü: 2.0 T Duratec-RS, 215 ë.ñ. íà 5500 îá/ìèí
Ðàáî÷èé îáú¸ì äâèãàòåëÿ: 1988 êóá.ñì.
Ìàêñèìàëüíàÿ ñêîðîñòü: ÌÊÏÏ - 232 êì/÷, ÀÊÏÏ - 200 êì/÷
Âðåìÿ ðàçãîíà (0-100 êì/÷), ñ: 6.4
</Description>
</Car>
</Cars>
save it then enter the game and you are done, the car should show up in the game menu.