Add the method of CopulaABC

[xuhuifan]

Summary:

Hi Henri, Is this version works for you? I will add more test file to it soon. Xuhui

Please make sure

• You have updated the CHANGELOG.rst
• You have updated the documentation (if applicable)

Copyright and Licensing

Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):

By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:

• Code: BSD3 (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[vuolleko]

Thanks Xuhui, looks pretty nice already! I'll have a closer look once you add some tests.

Also, the CopulaABC_Sample class is missing.

[wleoncio]

Hi @xuhuifan, any news on the test file? The sooner we get one, the sooner we can add your contribution to the package.