docs(tests): update README and nhs_rap.md following implementation of CI for tests

Author: amyheather

README.md

@@ -5,6 +5,7 @@
 ![python](https://img.shields.io/badge/-Python_3.13-306998?logo=python&logoColor=white)
 ![licence](https://img.shields.io/badge/Licence-MIT-green.svg?labelColor=gray)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.14622466.svg)](https://doi.org/10.5281/zenodo.14622466)
+![Tests](https://github.com/pythonhealthdatascience/rap_template_python_des/actions/workflows/tests.yaml/badge.svg)
 
 A simple template for creating DES models in Python, within a **reproducible analytical pipeline (RAP)** <br>
 Click on <kbd>Use this template</kbd> to initialise new repository.<br>
@@ -136,6 +137,8 @@ To run tests, ensure environment is active and located in main directory (i.e. p
 pytest
 ```
 
+The repository contains a GitHub action `tests.yaml` which will automatically run tests with new commits to GitHub. This is continuous integration, helping to catch bugs early and keep the code stable.
+
 You can lint the `.py` files by running either of this commands from the terminal:
 
 ```
@@ -182,6 +185,7 @@ This section describes the purposes of each class in the simulation.
 
 ```
 repo/
+├── .github/workflows/    # GitHub actions
 ├── docs/                 # Documentation
 ├── scripts/              # Code for DES model and analysis
 ├── tests/                # Unit tests

docs/nhs_rap.md

@@ -44,7 +44,7 @@ Meeting all of the above requirements, plus:
 
 | Criteria | Completion | Further details |
 | - | - | - |
-| Code is fully [packaged](https://packaging.python.org/en/latest/). | ✅ |
-| Repository automatically runs tests etc. via CI/CD or a different integration/deployment tool e.g. [GitHub Actions](https://docs.github.com/en/actions). | ❌ | **TODO: Set up tests to run with GitHub actions** |
+| Code is fully [packaged](https://packaging.python.org/en/latest/). | ✅ | `__init__.py` (shows directory should be treated like package) and `pyproject.toml` (specifies package details) |
+| Repository automatically runs tests etc. via CI/CD or a different integration/deployment tool e.g. [GitHub Actions](https://docs.github.com/en/actions). | ✅ | `.github/workflows/tests.yaml` |
 | Process runs based on event-based triggers (e.g., new data in database) or on a schedule. | N/A | - |
 | Changes to the RAP are clearly signposted. E.g. a changelog in the package, releases etc. (See gov.uk info on [Semantic Versioning](https://github.com/alphagov/govuk-frontend/blob/main/docs/contributing/versioning.md)). | ✅ | `CHANGELOG.md` and GitHub releases |