check recommended up/downstream MR.P modules in resources of all READMEs

[sreichl]

• [x] formulate one descriptive concise sentence per module
• [x] add all of them to the MR.P template

[sreichl]

or always refer to fitting recipes, so to only have one place to maintain the recommended MR.P modules? but less crosslinking...

[sreichl]

Have both. Up- and downstream recommended/compatible modules And Recipes that use/include this module

[sreichl]

Maximise cross linking