The world’s largest PC maker is announcing its first mainstream Chromebooks today, making the company the latest in a long list of Windows manufacturers to hop on board Google’s stripped-down operating system. Lenovo is unveiling two Chromebooks today, the N20 and N20p. Both models are identical save a 300-degree rotating touchscreen on the N20p that lets you use it in a more comfortable touch-only mode. Unfortunately, Chrome OS largely remains ill-suited to touch, but it should be an appealing option for some. In terms of hardware, that’s the only big surprise here. The Chromebooks are fitted with 11.6-inch, 1366 x 768 screens, Haswell-based Intel Celeron processors, 2GB of RAM, and 16GB of storage — all of which are fairly standard….