Add README_zh.md

[sixg0000d]

Translate README.md to Chinese and add Chinese demos.

[micl2e2]

Thanks for your contribution! Your work is so impressive that it satisfies most of the project's criteria. But there are still some parts that could have been done better:

1. Since the pictures are directly saved as repository content, the
   size of them is very crucial. Compared to the current demo's size(928K), yours is 3.2M in total, at least 3 times larger than the EN version. Consider reducing the size by compression, less than 1M is perfect, and less than 1.5M is fine, but the larger won't be accepted. Note that the sharpness is sufficient as long as the text and other contents inside the picture can be readily seen and understood by a normal human.
2. The zh is ambiguous. Consider adding a region code to it.
3. Consider adding a preamble line of the translation for the following line, placed just before "Table of Contents":

   **(The translation might probably be outdated. Refer to the English version of README for the latest documentation.)**
   

[sixg0000d]

Thanks for your contribution! Your work is so impressive that it satisfies most of the project's criteria. But there are still some parts that could have been done better:

1. Since the pictures are directly saved as repository content, the
   size of them is very crucial. Compared to the current demo's size(928K), yours is 3.2M in total, at least 3 times larger than the EN version. Consider reducing the size by compression, less than 1M is perfect, and less than 1.5M is fine, but the larger won't be accepted. Note that the sharpness is sufficient as long as the text and other contents inside the picture can be readily seen and understood by a normal human.
2. The zh is ambiguous. Consider adding a region code to it.
3. Consider adding a preamble line of the translation for the following line, placed just before "Table of Contents":

   **(The translation might probably be outdated. Refer to the English version of README for the latest documentation.)**
   

Got it, I will improve them later.

[sixg0000d]

Thanks for your contribution! Your work is so impressive that it satisfies most of the project's criteria. But there are still some parts that could have been done better:

1. Since the pictures are directly saved as repository content, the
   size of them is very crucial. Compared to the current demo's size(928K), yours is 3.2M in total, at least 3 times larger than the EN version. Consider reducing the size by compression, less than 1M is perfect, and less than 1.5M is fine, but the larger won't be accepted. Note that the sharpness is sufficient as long as the text and other contents inside the picture can be readily seen and understood by a normal human.
2. The zh is ambiguous. Consider adding a region code to it.
3. Consider adding a preamble line of the translation for the following line, placed just before "Table of Contents":

   **(The translation might probably be outdated. Refer to the English version of README for the latest documentation.)**
   

I had solve these 3 problems, please review my latest commits.