Merge pull request #33 from WorldHealthOrganization/32-ferretdb-steps

Add docs folder with ferret config doc

Author: smbuthia

docs/configuring-ferret-db.md

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+## Using FerretDB in place of MongoDB
+
+### Overview
+
+Go.Data works best with MongoDB because of its extensive features and flexibility. However, if you would like to use a fully Open Source alternative, you may configure [FerretDB](https://docs.ferretdb.io/), a proxy that translates MongoDB protocol queries to SQL, with PostgreSQL (or SQLite) as the database engine.
+
+## Steps
+
+### 1. Set up FerretDB and PostgreSQL locally with Docker
+
+Use the [intructions from FerretDB documentation](https://docs.ferretdb.io/quickstart-guide/docker/) to deploy FerretDB.
+
+You will be asked do a local setup of FerretDB and PostgreSQL using Docker Compose.
+
+### 2. Run the Go.Data installer with the FerretDB arguments in place of the MongoDB arguments
+
+In the [Download Installer](https://github.com/WorldHealthOrganization/GoDataSource-Installers?tab=readme-ov-file#5-download-installer) step of creating a running the Go.Data installers, pass the FerretDB arguments in `--dbport` and `--dbpath`. 
+
+For MacOS and Windows installations, these arguments may be requested during the installation process.
+
+Note: Go.Data has not been extensively tested with FerretDB. The Go.Data maintainers will update these steps as further improvements are made to the Go.Data project.