chore(docs): update README with basic instructions

README.md

@@ -1,2 +1,35 @@
-# dvc-sql-example
-A simple DVC pipeline to fetch from an SQL DB, cache as parquet for reproducibility and faster processing
+# DVC Azure SQL example
+
+A simple DVC pipeline to fetch from an SQL DB, cache as parquet for
+reproducibility and faster processing.
+
+## Install
+
+```bash
+python3 -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt
+```
+
+Depending on the setup and machine, you might need to install ODBC driver. It
+depends on the OS, please refer to MS ODBC setup docs.
+
+## Setup
+
+Create and `.env` file with:
+
+
+```env
+AZURE_CONNECTION_STRING="DRIVER={ODBC Driver 18 for SQL Server};SERVER=<server>.database.windows.net,1433;DATABASE=<db>;UID=<user>;PWD=<password>"
+```
+
+This file is in `.gitignore`. 
+
+> Note! There should be a better way to manage Azure credentials (e.g. using AD
+> or managed identities. This is example is made simple, but we recommend to
+> explore other options.
+
+## Running
+
+Run `dvc repro` or `dvc exp run` to reproduce the pipeline. Use regular
+`dvc push`, `dvc pull`, etc, to save and load artifacts.