[DOC] Add CHANGELOG.md

[miguelusque]

Report incorrect documentation

Location of incorrect documentation
It is missing a CHANGELOG.md file at the root of the project.

Please, add what you would like to be added in that file.

I will group all of them and generate a file similar to this:

https://github.com/rapidsai/cudf/blob/branch-0.10/CHANGELOG.md

It might be useful to have a look at this project for reference:

https://github.com/rapidsai/gQuant/projects/1

[avolkov1]

Take a look at this project:
https://github.com/github-tools/github-release-notes

Maybe we can automatically generate changelog.

gren changelog

[avolkov1]

Fixed in PR #94 commit 5d53970.