v0.1.0

SurvivalBase v0.1.0

Merged pull requests:

• Bump julia-actions/cache from 1 to 2 (#1) (@dependabot[bot])
• Bump julia-actions/setup-julia from 1 to 2 (#2) (@dependabot[bot])
• Add struct and strata (#4) (@lrnv)
• [docs] Rudimentary documentation (#5) (@lrnv)