Added license and docs

...P/1. Data Collection/DurableHNSWCorpus + Dictionary.swift

...tNLP/1. Data Collection/DurableHNSWCorpus + File IO.swift

...NLP/1. Data Collection/DurableHNSWCorpus + Sequence.swift

Sources/SwiftNLP/1. Data Collection/DurableHNSWCorpus.swift

...LP/1. Data Collection/EphemeralHNSWCorpus + Codable.swift

...1. Data Collection/EphemeralHNSWCorpus + Dictionary.swift

...P/1. Data Collection/EphemeralHNSWCorpus + Sequence.swift

...ces/SwiftNLP/1. Data Collection/EphemeralHNSWCorpus.swift

...NLP/1. Data Collection/HNSW/CartesianDistanceMetric.swift

...tNLP/1. Data Collection/HNSW/CosineSimilarityMetric.swift

...on/HNSW/DeterministicEphemeralVectorIndex + Codable.swift

...ftNLP/1. Data Collection/HNSW/HNSWCorpusDataHandler.swift