fix base64 testcase

Create CONTRIBUTING.md

Update README.md

chore(README): update version to 1.2.58

Once the previously submitted CONTRIBUTING.md file has been merged with the master branch, it would be helpful if there was a dedicated section and hyperlink to the CONTRIBUTING.md file on the README.md page as it is the page that most new users will first visit. By including this link on the README.md page, new users will be presented will more information about the project and may be more likely to contribute.

It does not appear that there is a CONTRIBUTING.md file for this project at the present time. Unfortunately, this means that new users who are looking to add to this project may not do so because they do not know where to begin. I hope that this CONTRIBUTING.md file can serve as a base for this project to build upon.

It does not appear that there is a CONTRIBUTING.md file for this project at the present time. Unfortunately, this means that new users who are looking to add to this project may not do so because they do not know where to begin. I hope that this CONTRIBUTING.md file can serve as a base for this project to build upon.