Add CHANGELOG.md file

CHANGELOG.md file is missing. Please add it and fill it out for at least the latest version.

Please use the latest version of [Infinum's default changelog template](https://github.com/infinum/default_rails_template/blob/master/GEM_CHANGELOG_TEMPLATE.md):

# Changelog

## [v1.0.0](https://github.com/infinum/some-gem/tree/v-current) (YYYY-MM-DD)
[Full Changelog](https://github.com/infinum/some-gem/compare/v-previous...v-current)

### Enhancements

- Added something [\#52](https://github.com/link-to-pr-or-issue)


### Bugfixes

- Fixed something [\#52](https://github.com/link-to-pr-or-issue)


### Breaking changes / Deprecations

- Changed something [\#52](https://github.com/link-to-pr-or-issue)


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Add CHANGELOG.md file #4

Changelog

v1.0.0 (YYYY-MM-DD)

Enhancements

Bugfixes

Breaking changes / Deprecations

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Add CHANGELOG.md file #4

Description

Changelog

v1.0.0 (YYYY-MM-DD)

Enhancements

Bugfixes

Breaking changes / Deprecations

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

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