Add Java implementation

[juliardi]

Hi,
Thank you for sharing the algorithm of Navicat password encryption and decryption also the python code implementation.
I'm happy to be able to port it to Java and if you would like please merge it to your repository.
Thank you,

Juliardi

[juliardi]

Hi,
It has been 2 months since I sent this pull request. Will you merge this or are there something wrong with the pull request?

[DoubleLabyrinth]

Well, I refactor my code and update README.md just now. You can see it in /python3/NavicatCrypto.py.
Your code has nothing wrong. But I suggest you add Java implementation for Navicat12 password encryption/decryption in NCX (Navicat Connection eXport) file. I've implemented it in Python3 and you can take a reference.

Navicat12 changed the encryption algorithm for password in NCX file. If you have Navicat12, and export one of your connection configurations with password, you will find that encrypted password cannot be decrypted by previous algorithm I said.
For example, if you password is 12345678, connections.ncx generated by Navicat12 says encrypted password is 75008D0AE102C19EE3767E201AC9E4D2 while previous algorithm says it is 9AA92D8A5BDCB3F7.

[juliardi]

Thank you for your information. I will try to port your new implementation to Java.