Add user guides.
Add user guides.

shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win,shishaochen/TensorFlow-0.8-Win