Release v2.0.0

[sanak]

For Release v2.0.0

@dkastl @nobnisai
Could you check the diff of this PR (especially README.md) ?

Changes proposed in this pull request:

• Added .gitignore and .editorconfig files.
• Translated Japanese words.
• Update README.md
  • Update Requirements section. (Redmine >= 4.0.0 4.2.0)
  • Update Version history section. (Add Ftr/add configuration setting #45 functionality)
  • Add @nobnisai name to Authors section.

@gtt-project/maintainer

[sanak]

Thanks for approve!

I forgot to mention, but Japanese translation look is as follows.

@dkastl
Are you okay to comment out the following broken ci badge, once ?
(I am thinking to support it at next minor version release on #3.)

[sanak]

Well, I commented out the CI badge with the following commit.

• commit: e50f6c4

I will merge this now and add tag/release for v2.0.0.