message: Update sdk readme
diff: # 3D Time of Flight : sdk
  #### Overview
  -Container for SDK source and header files
  +Contains the SDK source and header files.
  #### Directory Structure
  | Directory/File | Description |
  | --------- | ----------- |
  -| src | Contains the source code of sdk |
  +| include | Contains the public headers of the SDK |
  +| src | Contains the source code of the SDK |
  | CMakeLists.txt | Rules for building the SDK source code on various platforms |
  -
  