add github action for testing coverage and badges to readme

Author: yiwen-h

.github/workflows/codecov.yaml

@@ -0,0 +1,35 @@
+name: CodeCov
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Install the latest version of uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          version: "latest"
+          activate-environment: true
+
+      - name: Install dependencies
+        run: uv pip install -e ".[dev]"
+
+      - name: Generate Report
+        run: uv run pytest --cov=. tests/unit --ignore=tests --cov-branch --cov-report xml:coverage.xml
+
+      - name: Upload Coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}

README.md

@@ -1,5 +1,12 @@
 # Renal capacity model
 
+<!-- badges: start -->
+
+[![Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public.](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip)
+[![codecov](https://codecov.io/gh/The-Strategy-Unit/renal-capacity-model/graph/badge.svg?token=lr1OaInPCf)](https://codecov.io/gh/The-Strategy-Unit/renal-capacity-model)
+
+<!-- badges: end -->
+
 Repository with Python code for the Renal Capacity Model, an open source implementation of the Discrete Event Simulation (DES) [Renal Services model created in collaboration with the Midlands Renal Operational Delivery Network (MRODN)](https://github.com/The-Strategy-Unit/renal-services).
 
 ⚠️ **Please note that the code in this repository is still in development**