Add README.md

Author: kare

.github/workflows/test.yaml

@@ -1,5 +1,5 @@
 on: [push]
-
+name: Test
 jobs:
   test:
     runs-on: ubuntu-latest

README.md

@@ -0,0 +1,74 @@
+<p align="center">
+  <a href="https://streamr.network">
+    <img alt="Streamr" src="https://raw.githubusercontent.com/streamr-dev/streamr-docker-dev-action/master/docker-header-img.png" width="1320" />
+  </a>
+</p>
+<h1 align="left"></h1>
+# streamr-docker-dev-action
+![.github/workflows/test.yaml](https://github.com/streamr-dev/streamr-docker-dev-action/workflows/.github/workflows/test.yaml/badge.svg)
+
+## Description
+`streamr-docker-dev-action` is a custom GitHub Action that:
+- Clones `streamr-docker-dev` command line tool (available via `./streamr-docker-dev/streamr-docker-dev/bin.sh`)
+- Starts Streamr Docker stack
+
+## Required input arguments
+None.
+
+## Optional input arguments
+Currently the following services are started by default:
+- mysql
+- redis
+- engine-and-editor
+- cassandra parity-node0
+- parity-sidechain-node0
+- bridge
+- data-union-server
+- broker-node-storage-1
+- nginx
+- smtp
+- platform
+
+You can customise services that are required by your use case with `services-to-start` input parameter.
+For example:
+```
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Use streamr-docker-dev-action to start a few services
+    steps:
+    - uses: actions/checkout@v2
+    - id: start-docker-services
+      uses: streamr-dev/streamr-docker-dev-action@v1
+      with:
+        services-to-start: 'redis mysql engine-and-editor'
+```
+
+## Required output arguments
+None.
+
+## Optional output arguments
+None.
+
+## Secrets
+None.
+
+## Environment variables
+None.
+
+## Example
+```
+on: [push]
+
+jobs:
+  example:
+    runs-on: ubuntu-latest
+    name: Using streamr-docker-dev-action
+    steps:
+    - uses: actions/checkout@v2
+    - uses: streamr-dev/streamr-docker-dev-action@v1
+    - run: npm ci && npm test
+      shell: bash
+```

action.yaml

@@ -4,6 +4,7 @@ inputs:
   services-to-start:
     description: 'Streamr Docker Stack services to start'
     required: false
+    # If changing the default list of services below, update examples in README.md
     default: 'mysql redis engine-and-editor cassandra parity-node0 parity-sidechain-node0 bridge data-union-server broker-node-storage-1 nginx smtp platform'
 runs:
   using: "composite"