restructuring the git repo

.cirrus.yml

.gitignore copy

.travis.yml

.zenodo.json

Krylov.jl/.github/workflows/CompatHelper.yml

Krylov.jl/.github/workflows/TagBot.yml

LICENSE.md

Project.toml

README.md

appveyor.yml

benchmark/REQUIRE

benchmark/benchmarks.jl

benchmark/cg_bmark.jl

benchmark/run_benchmarks.jl

benchmark/solver_benchmark.jl

benchmark/tune.json

docs/Project.toml

docs/make.jl

docs/src/api.md

docs/src/assets/logo.png