Add summary instructions and copyright notice

README.md

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 # AGS Utilities
 
-A FastAPI implementation of the [AGS Python library](https://gitlab.com/ags-data-format-wg/ags-python-library) to:
+HTTP API for the [AGS Python library](https://gitlab.com/ags-data-format-wg/ags-python-library).
+
+It can:
 
 - Validate AGS files to v4.x of the AGS data format standard
-- Convert AGS files .ags<>.xlsx
+- Convert between AGS format files and spreadsheets files `.ags` <-> `.xlsx`
 
 Additionally .ags files can be validated for submission to the [National Geoscience Data Center (NGDC)](http://transfer.bgs.ac.uk/ingestion)
 
-# Documentation 
 
-Read the docs at https://britishgeologicalsurvey.github.io/AGS-Validator/ for full documentation
+## Documentation 
+
+Read the docs at https://britishgeologicalsurvey.github.io/AGS-Validator/ for full documentation.
+
+
+## Quick start
+
+The simplest way to run the validation service is via Docker:
+
+```
+docker run -p 80:80 --name ags-validator ghcr.io/britishgeologicalsurvey/ags_utilities
+```
+
+Navigate to [http://localhost](http://localhost) to see the landing page or
+[http://localhost/docs](http://localhost/docs) to see the API documentation via
+the Swagger interface.
+
+
+## Development
+
+### Running locally
+
+AGS Validator is written in Python and based on the
+[FastAPI](https://fastapi.tiangolo.com/) framework.
+It runs on the [Uvicorn](https://www.uvicorn.org/) ASGI server.
+
+Use the following commands to run the API locally:
+
+```bash
+git clone https://github.com/BritishGeologicalSurvey/AGS-validator
+cd AGS-validator
+pip install -r requirements.txt
+uvicorn app.main:app --reload
+```
+
+By default, the API is served at
+[http://localhost:8000](http://localhost:8000).
+
+### Running tests
+
+Use the following to run the tests:
+
+```bash
+pip install -r requirements_dev.txt
+export PYTHONPATH=.
+pytest -vs test
+```
+
+The test environment is configured so that adding `--pdb` to the test command
+will start an IPython debugger session in the event of test failure.
+
+
+### Licence
 
+`AGS Validator` was created by and is maintained by the British Geological Survey.
+It is distributed under the [LGPL v3.0 licence](LICENSE).
+Copyright: © BGS / UKRI 2021