update 3 new airports in Vietnam

​I from Vietnam Airlines website find that,in Vietnam three civil airports did't be added to Airlinesim,there are:
Con Dao Airport —— IATA:VCS、ICAO:VVCS,length of runway is 1,830m
Chu Lai International Airport —— IATA:VCL、ICAO:VVCA,length of runway is 3,050m
Thanh Hoa Tho Xuan Airport —— IATA:THD、ICAO:VVTX,Length of runway is 3,200m
Please add to them quickly prossible and update world airports data regularly.

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Sorry for not writing more before but I hate writing on my phone.

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