If there's a makefile, I would suggest opening a terminal, su-ing to root, cd-ing to the directory and typing "make" (without the quotes). This would presumably make the driver module. Whether it would then install it automatically I don't know, but I would hope that if it did not that there would be further instructions printed to the screen at the conclusion of the make operation. It is possible that you will need to have the kernel source installed as well, but again, without a readme, that's hard to say. Can't hurt
.
According to the filelist of the driver on
this site, there should be a readme in the /Linux folder (or you could download the driver again from that site and see if it includes the readme that your CD apparently lacks), but if you really can't find it, I would suggest going
to this SURECOM forums post, which will suggest that you either:
1. update your kernel (because later kernels have support for this model built in)
or
2. leads to
http://www.myson.com.tw, where you should click English in the sidebar (unless you read Taiwanese), then Downloads, then type MTD803 in the search box, then download the most current drivers for whichever kernel series you're using, and follow the instructions contained inside the archive.
Hope this helps.