A Guide on interfacing between memory safe by default and non-memory safe by default languages

[balteravishay]

Publish a guide on interfacing between memory safe by default and non-memory safe by default languages

Some initial drafts:

• https://github.com/ossf/Memory-Safety/blob/main/docs/best-practice-interfacing.md
• https://www.swift.org/documentation/cxx-interop/ (Swift C++ interop, reference provided upon request)