Create assessment.md
Create assessment.md

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Former-commit-id: e67479d2aac44526be7852e2fad623b8ef351b0f [formerly 94ffc626f5dd09f96d3aa018f6de96b65ed033f6]
Former-commit-id: 3ba5f8cfa62cf32329ba7e6e3009dd39699f13ed
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io