Add update BioConductor to README

[sannegovaert]

I converted the repository README to R Markdown for the B-cubed documentation website. The first time I tried to build the site the Rmd rendering failed. After running the following command locally the build succeeded:

BiocManager::install(version = "3.22")

I suggest to add this code to the README.
This is useful for:

• other users
• when the documentation website is updated, we do this automatically with scripts. All the code in the source scripts is ran. But running extra manual code is cumbersome and might be forgotten.

See b-cubed-eu/documentation#112

[E-O-Conchas]

@sannegovaert Thank you very much for reporting this.

I’ve updated the README installation instructions to include the Bioconductor version setup step before installing the required Bioconductor packages.
This should help make the documentation build more reproducible and avoid the extra manual step during rendering.

Solved in: #59