In main project all similar Checks are located in "checks" package - https://github.com/checkstyle/checkstyle/tree/master/src/main/java/com/puppycrawl/tools/checkstyle/checks .
So please put your check to https://github.com/sevntu-checkstyle/sevntu.checkstyle/tree/master/sevntu-checks/src/main/java/com/github/sevntu/checkstyle/checks
No need to move to subfolder, just place java file in that folder
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Example of file name validation is there https://github.com/checkstyle/checkstyle/blob/master/src/main/java/com/puppycrawl/tools/checkstyle/checks/OuterTypeFilenameCheck.java#L69 , you do not need use other classes just copy code from them.
SinglelineDetector was referenced by me as example of how report an violation.