PDF link about Prioritizing Design Debt Investment Opportunities presentation is broken

[NolwennD]

Hello,

In readme, the following link is broken: https://resources.sei.cmu.edu/asset_files/Presentation/2011_017_001_516911.pdf

Maybe a copy could be kept in the repo.

[patomos]

I want to work on this ticket. I was able to find a copy of the PDF.

cc: @jimbethancourt