Update README

README.md

@@ -1,9 +1,41 @@
-# JavaScript Action Template
+# julia-runtest Action
 
-This template offers an easy way to get started writing a JavaScript action with TypeScript compile time support, unit testing with Jest and using the GitHub Actions Toolkit.
+This action runs the tests in a Julia package and uploads coverage results to [Coveralls](https://coveralls.io/) and [Codecov](https://codecov.io/).
 
-## Getting Started
+## Usage
 
-See the walkthrough located [here](https://github.com/actions/toolkit/blob/master/docs/typescript-action.md).
+Julia needs to be installed before this action can run. This can easily be achieved with the [setup-julia](https://github.com/marketplace/actions/setup-julia-environment) action.
 
-In addition to walking your through how to create an action, it also provides strategies for versioning, releasing and referencing your actions.
+This action accepts two inpus: `codecov` (with values `true` or `false`) and `coveralls` (with values `true` or `false`). These inputs control whether coverage results are automatically uploaded to the respective service. Both inputs have a default value of `true`.
+
+Uploads to [Coveralls](https://coveralls.io/) or [Codecov](https://codecov.io/) only work if an upload token for the respective service is stored as a Github Actions secret and made available to the action. These tokens need to be stored in the environment variables `CODECOV_TOKEN` and `COVERALLS_TOKEN`.
+
+And example workflow that uses this action might look like this:
+
+```
+name: Run tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        julia-version: [stable, lts]
+        julia-arch: [x64, x86]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        exclude:
+          - os: macOS-latest
+            julia-arch: x86
+
+    steps:
+      - uses: actions/checkout@v1.0.0
+      - uses: julia-actions/setup-julia@v0.2
+        with:
+          version: ${{ matrix.julia-version }}
+      - uses: julia-actions/julia-runtest@master
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+          COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
+```