There is no automatic method for tracing a bitmap in Solidworks but you can import a bitmap image to a sketch and manually trace over it.
Start a new sketch and go to Tools, Sketch Tools, Sketch Picture. Browse for your image file. Once the image is inserted you can scale it by dragging on the handles around the image. An easy way to get it scaled correctly is to sketch a line with a known length from the image and scale the image until the line in the bitmap matches the line you dimensioned. After the image is scaled correctly simple trace over it using the sketch tools. Once completed you can hide the image or delete it.