add cohort analysis README

add forecasting model README

added models to schema.yml

added new final forecasting mart

header comments added int_stage_probabilities.sql

add int_forecast_prep for forecast model

add int_weighted_pipeline for forecasting model

add int_stage_probabilities for forecast-model

Delete int_stage_probabilities.sql

add stg_quota for forecasting model

Delete forecasting-model/stg_quota.sql

add stg_opportunities for forecasting model

Delete forecasting-model/forecasting-model/sql/stg_opportunities.sql

Delete incorrect nested directory created by github

move int_weighted_pipeline into forecasting-model/sql