readded citschema and cif2bcif apps back from ciftools package

README.md

data/cif-field-names/bird-field-names.csv

data/cif-field-names/ccd-field-names.csv

data/cif-field-names/cif-core-field-names.csv

data/cif-field-names/mmcif-field-names.csv

data/cif-field-names/mmtf-filter.csv

package.json

src/apps/cif2bcif/converter.ts

src/apps/cif2bcif/index.ts

src/apps/cifschema/index.ts

src/apps/cifschema/util/cif-dic.ts

src/apps/cifschema/util/generate.ts

src/apps/cifschema/util/helper.ts

src/apps/cifschema/util/schema.ts