docs: add running instructions to readme

Author: tillywoodfield

README.md

@@ -1,10 +1,39 @@
 # OC4IDS Datastore Pipeline
 
-## Run linting
+A Python application to validate and store published OC4IDS datasets.
+
+## Local Development
+
+### Prerequisites
+
+- Python 3.12
+
+### Install Python requirements
+
+```
+python -m venv .venv
+source .venv/bin/activate
+pip install -r requirements_dev.txt
+```
+
+### Run app
+
+```
+pip install -e .
+oc4ids-datastore-pipeline
+```
+
+### Run linting and type checking
 
 ```
 black oc4ids_datastore_pipeline/
 isort oc4ids_datastore_pipeline/
 flake8 oc4ids_datastore_pipeline/
 mypy oc4ids_datastore_pipeline/
 ```
+
+### Run tests
+
+```
+pytest
+```