Adding readmes

reports/notebooks/README.md

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-These are reports for DART data analysis. 
+These are reports for DART data analysis. 
+
+Preliminary data extraction and cleaning happens in `src/scripts`. 
+Interim data files created during the cleaning process are stored in `data/interim` and/or `data/deidentified`, and then those cleaned data files are used in the notebooks here. 

src/scripts/README.md

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+These scripts contain all the code needed to create the data needed to replicate analyses in the `reports/notebooks` directory. 
+To go from raw data to analysis files, run the scripts here in order (start with 00_setup.R, then 01_redcap_api.R, etc.). 
+You will need API access to the REDCap projects where the raw data are. 
+
+The scripts `functions_data_cleaning.R` and `functions_plotting.R` each contain a handful of custom functions used in the data cleaning or analysis code for this project. 
+When custom functions are used, they are generally accompanied by a comment noting that they are saved in `functions_data_cleaning.R` or `functions_plotting.R`.
+They will also be called with `source()` at the beginning of the file using them.