Template for codecheck.Rmd

[langtonhugh]

The QMD file codecheck.Rmd that is generated after executing codecheck::create_codecheck_files() is for an existing report, rather than a demo template, and therefore does not knit without codecheckers first updating the manifest files with their own material. It would be useful for (first time) codecheckers to have a template that knits without any changes, using placeholder manifest files, so that they can better understand how to make their own report. Happy to make these changes if it's useful.

[nuest]

Yes, this would be very welcome.

I have to admit that I myself mostly work with an Rmd document that does not include the manifest at all, because most of my checks use the Reproducible AGILE template (https://github.com/reproducible-agile/reviews-2024/blob/main/report-template/reproreview-template.Rmd).

@langtonhugh Did you find the code utilising the manifest understandable and useful?

I'm happy to review this change and even happier if @sje30 can share his thoughts.

[langtonhugh]

I did not understand the use of manifest files at first. If the manifest files in the template are placeholder files that are downloaded when users execute remotes::install_github("codecheckers/codecheck"), then the initial build will work, and new users can better understand their role. Manifest files could also be defined in the README #59