Introduce TDengine connector

[门世斌]

Hi, there.
     We have completed the writing of the Introduction TDengine connector 
Google document. Please refer to the link below for specific content. If you 
have any questions, please feel free to contact us at any time.
     
https://docs.google.com/document/d/1pKSqL8gIlWNU4ukI4KdoNKgsEzOQMsOOL0pJ516AUkk/edit?usp=sharing