add api test script in example folder

[neo-workship]

add ragflow api test script

_ add ragflow api test script，include C#、Java、PHP、Go and so on script file

Type of change

• in example folder ，add different types API folder，include api test script file

[JinHai-CN]

@neo-workship
Thank you very much for your terrific contributions. I have some comments.

1. Too many files. Can you merge some operations in one file? such as all operations on dataset or all operations of Java.
2. Move some binary file out of the PR, such as the class file compiled from java source code.
3. Use English to comment the code and file name used in code.

[neo-workship]

@neo-workship Thank you very much for your terrific contributions. I have some comments.

1. Too many files. Can you merge some operations in one file? such as all operations on dataset or all operations of Java.
2. Move some binary file out of the PR, such as the class file compiled from java source code.
3. Use English to comment the code and file name used in code.

Ok, I'll reorganize the files and write the description, maybe in markdown file mode. The role of these documents is currently envisaged as follows:

• On the one hand, it is used to test the API, and the documentation formed can also guide novice users.

• On the other hand, third-party systems using different technology stacks (such as PHP, Java, C#, etc.) can be integrated with Ragflow quickly (this may be the most important application and promotion mode of Ragflow).

• Finally, these scripts may eventually form SDK or tools, the purpose is to let the third-party system as long as the introduction of these sdk or tools, Ragflow as the AI back-end, to add AI capabilities to the third-party system