Added description about topic models
Added description about topic models

IntelligentSystemsLaboratory/JGI-PURE-Challenge,IntelligentSystemsLaboratory/JGI-PURE-Challenge,IntelligentSystemsLaboratory/JGI-PURE-Challenge,IntelligentSystemsLaboratory/JGI-PURE-Challenge,IntelligentSystemsLaboratory/JGI-PURE-Challenge