Initial README file

README.md

@@ -1 +1,78 @@
 # Matrix-Chat-Message
+
+## What does this action do?
+
+:bulb: This action can send a message to a [Matrix](https://matrix.org/) chat room.
+
+## Prerequisites
+You will need the following to successfully setup the action
+- [ ] Account on a Matrix server
+- [ ] Account access token
+- [ ] The internal room ID of the room where you want to send the message
+
+### Where to Find those Things?
+
+### Account on a Matrix Server
+If you do not have a Matrix account yet or want to register a new one just for this GitHub action check out https://publiclist.anchel.nl/ for a list of public homeservers.
+
+The username is the part between `@` and `:` in the MXID while the homeserver is the part after the `:` (in `@someone:example.org` the username is `someone` and the homserver is `example.org`).
+
+
+### Matrix Access Token
+To get the access token follow the following steps:
+
+* Open a [Element web client](https://app.element.io/) (if you use that same client for anything else open it in a private window).
+* Sign in with your username and password.
+  * If you enter your username in the MXID format (`@username:server.tld`) it will automatically switch to the correct server.
+* When prompted to `Verify this login` press `Skip` (2x times).
+  * As this GitHub Action currently does not support any encryption there is no need to set it up.
+* `Close` the notification that you are not receiving desktop notifications.
+* Click on your username in the top left corner, a menu will open.
+* Select `All settings`, Select `Help & About`, scroll down.
+* Click on the `<click to reveal>` text at the bottom to unconver the access token.
+* Copy the token as it is displayed.
+
+### Internal Room ID
+* Use the Element session from the access token step to join the target room
+* Open the `Room settings` screen
+  * You might need to click the "info" icon in the top right corner to be able to see the `Room settings` link
+* Navigate to `Advanced` and copy the room id.
+  * The format of the room ID is `!<random characters>:example.org`
+
+## Usage
+
+### Configure GitHub Secrets
+* Open your GitHub repository in your browser
+* Navigate to `Settings`, navigate to `Secrets`
+* Create a new secret by clicking the `New secret` button
+  * Name: `MATRIX_TOKEN`
+  * Value: Insert the token you copied before. Make sure that there is no newline at the end.
+
+### Setup Workflow
+Define a workflow in `.github/workflows/matrix-chat-message.yml` (or add a job if you already have defined workflows).
+
+:bulb: Read more about [Configuring a workflow](https://help.github.com/en/articles/configuring-a-workflow).
+
+### Example Workflow File
+```yaml
+on: [push]
+
+jobs:
+  send-message:
+    runs-on: ubuntu-latest
+    name: Send message via Matrix
+    steps:
+    - name: Send message to test channel
+      id: matrix-chat-message
+      uses: fadenb/[email protected]
+      with:
+        homeserver: 'matrix.org'
+        token: ${{ secrets.MATRIX_TOKEN }}
+        channel: '<INSERT YOUR ROOM ID HERE>'
+        message: 'This is an example message. It even supports the use of variables like ${{ github.sha }}'
+```
+
+* Replace matrix.org with the address of your server.
+* Replace `<INSERT YOUR ROOM ID HERE>` with the room ID you gathered before (it looks like `!nkJduYevFfQSxSMMMP:example.org`).
+* Replace the example message with your own.
+