By Paul Carsten BEIJING (Reuters) – Chinese budget smartphone maker Xiaomi unveiled on Thursday its first tablet, expanding its product lineup to directly challenge established rivals Samsung Electronics Co Ltd and Apple Inc. The MiPad, which comes in six colors, will have a 7.9 inch screen, the same size as an iPad Mini. \We wanted the hardware to come close to, or even surpass Apples iPad,\ Xiaomis founder Lei Jun said at the launch event in Beijing. Xiaomis flagship smartphones, which are among the fastest selling in China, resemble Apples iPhone. It was also not clear if the MiPad would be sold outside China.