OS X :: Add Basic Info Like PDF Documentation To App Packages?

For many of the applications I have (including Apple applications such as Aperture, iWork, etc), I have PDFs of the User Manuals that I've downloaded from Apple or other support websites. Would there be any harm in me dropping my user manual PDFs into the package at the top level (outside the >Contents folder)? I absolutely know to be cautious about messing with items within the >Contents folder, but wondering whether there is any harm in dropping in user guides or other related reference information into the package, outside the Contents or other key program folders within the folder.

Ultimately, I'm just looking for a way to keep my documentation organized and with whatever program it corresponds to. I've found that too many times, I download program manuals and tip sheets, and then I can't find where I put them on my hard drive. Also trying to avoid having duplicates of folders (i.e., a "Photoshop" folder in my /Applications and a "Photoshop" folder in my /Documents).