I agree completely with Dwight ... but in the case of a school project, if the issue is a design assignment that will not be dimensioned, or if it is 'context buildings' for your design, then precision is not necessarily essential.
Besides approximate tracing of the image placed into a worksheet and used as a trace reference ... there will be no snapping, just an overlay... you can convert a reasonably crisp image into a dwg that you can then place and either snap to or, if lucky, magic wand to speed up the conversion process. (Again...this will never work accurately enough for a real project!)
If you have Adobe Illustrator, it can perform this conversion to dwg. There are other things out there as well. Probably not worth the time unless the drawing is pretty complex.
Cheers,
Karl
One of the forum moderators
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