Add readme for fhir views

README.md

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+# HDU API DATA AGGREGATION
+
+## HDU API VIEWS (FLATTERNING FHIR RESOURCES DATA)
+
+### VIEWS Folder
+
+- Defines the selected FHIR resources from Ministry of Health (MoH) Tanzania FHIR Implementation Guide i.e MoHTanzania-IG
+
+### Data Extraction Queries
+
+- Dynamically generated using the `create-queries.js` that use mappings.
+- Mappings have been created using interface where user is presented with data fields from DHIS2 aggregate tools plus other important parameters like `Gender`, `Age group`, `Age type`, `ICD codes` and `LOINC codes`
+- Date for aggregating the data have been chosen with respect to kind of data or how the respective data for producing aggregate are produced. Take an example of `Encounter` period and `DiagnosticReport` effective datetime