Having made its name over the years as a competitor to Apple for both iPods and iPads, Archos has announced that it is beginning to create Apple-compatible accessories, starting with its new Bluetooth Keyboard for iPad ($79). Archos claims that this is the thinnest iPad keyboard available, measuring only 5 mm thick, and attaching with magnets to the second-, third-, and fourth-generation iPad. It includes automatic screen on/off functionality…