Fix headlines

[nikeee]

GitHub recently changed the way they parse markdown, especially headlines.
Because headlines now require a space after #, the table of the gradle commands is not rendered correctly.

This PR fixes the headlines of the README.md

[ghost]

Your pull request doesn't follow our guidelines. Please fix the following:

• Pull request description must include verification steps (?)

Click here for details.

Thank you! 🙏

_{This comment was made by GitMagic – Magically enforcing your contribution guidelines.}

[StefanLindel]

thank you