I'd start by removing the aerator
(see image) at the end of the faucet spout. Remove the aerator, clean it and then run water WITHOUT the aerator in place and see how water flows. If water flow is good without the aerator in place then pressure/volume will be restored when you reinstall the cleaned aerator. If water flow is poor with the aerator removed, check the shutoffs, supply lines, etc., as Milo suggested.