Update README.md

Author: iqiukp

README.md

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 * Multiple kinds of kernel functions
 * Support for dimensionality reduction, fault detection, and fault diagnosis
 * Support for data reconstruction
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 ## Notices
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 <p align="middle">
   <img src="https://github.com/iqiukp/Kernel-Principal-Component-Analysis-KPCA/blob/master/imgs/circle.png" width="420">
 </p>
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 ## Demo for data reconstruction ('circle' data)
 
 <p align="middle">
   <img src="https://github.com/iqiukp/Kernel-Principal-Component-Analysis-KPCA/blob/master/imgs/circle(re).png" width="420">
 </p>
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 ## Demo for fault detection (TE process data)
 
 <p align="middle">
   <img src="https://github.com/iqiukp/Kernel-Principal-Component-Analysis-KPCA/blob/master/imgs/TE_fd.png" width="420">
 </p>
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 ## Demo for fault diagnosis (TE process data)
 
 <p align="middle">
   <img src="https://github.com/iqiukp/Kernel-Principal-Component-Analysis-KPCA/blob/master/imgs/TE_fd_fd.png" width="420">
 </p>
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