Verifiable Condition in didDoc W3c spec (draft)

[Vishwas1]

• https://w3c-ccg.github.io/verifiable-conditions/

• https://w3c.github.io/did-spec-registries/#verifiablecondition2021

  It can be used to combine verification methods together to form conjugated conditions such as logical operations &&, thresholds, weighted thresholds, relationships and a delegation to external verification methods.