Feature/phpy

[chaz6chez]

1. Optimized the code structure of the tool bin/phpy
2. The tool PHPy emulates Composer to implement the following commands:
   1. bin/phpy install [Quickly build the environment and install dependencies based on phpy.json.]
   2. bin/phpy update [Update dependencies based on phpy.json.]
   3. bin/phpy scan [Automatically scan and import dependent Python modules based on the configuration in phpy.json.]
   4. bin/phpy show [Display the environment and dependencies.]
   5. bin/phpy init-config [Initialize phpy.json.]

[chaz6chez]

还有少许测试需要做，等测试完毕后再合并

[chaz6chez]

做了简单的测试，增加了文档教程