docs: update README with full documentation

README.md

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 # n8n-nodes-wizpixel-flow
 
-n8n community node for WizPixel Flow.
+[n8n](https://n8n.io/) community node for [WizPixel Flow](https://flow.wizpixel.com) — the creative production engine that renders HTML5 banners and MP4 videos across every format and locale automatically.
+
+## Features
+
+- **Submit render jobs** — trigger a render with your template, variables, locales and output formats
+- **Poll for completion** — optionally wait for the job to finish and get the download URL directly
+- **List templates** — browse your Flow templates from within n8n
+- **Get job status** — check any job by ID
+
+## Installation
+
+### In your n8n instance
+
+Go to **Settings → Community Nodes → Install** and search for:
+
+```
+n8n-nodes-wizpixel-flow
+```
+
+### Docker / self-hosted
+
+```bash
+docker exec -it <your-n8n-container> npm install -g n8n-nodes-wizpixel-flow
+docker restart <your-n8n-container>
+```
+
+## Credentials
+
+1. Generate an API key in your [WizPixel Flow account](https://app.wizpixel.com)
+2. In n8n, add a new credential of type **WizPixel Flow API**
+3. Paste your API key and confirm the base URL (`https://api.wizpixel.com/v1`)
+
+## Operations
+
+| Operation | Description |
+|-----------|-------------|
+| **Render** | Submit a render job for a template across formats and locales |
+| **Get Job** | Retrieve the status and download URL of a job |
+| **List Templates** | Return your available Flow templates |
+
+### Render parameters
+
+| Parameter | Description |
+|-----------|-------------|
+| Template ID | The Flow template to render |
+| Output Formats | Select from all 22 supported formats |
+| Locales | Comma-separated locale codes, e.g. `en,it,fr` |
+| Variables | JSON object of `{{variable}}` substitutions |
+| Include Video | Also render MP4 versions |
+| Wait for Completion | Poll until the job finishes and return the ZIP download URL |
+
+## API contract
+
+| Method | Endpoint | Description |
+|--------|----------|-------------|
+| GET | /v1/account | Credential test |
+| GET | /v1/templates?limit=N | List templates |
+| POST | /v1/render | Submit render job |
+| GET | /v1/jobs/:id | Poll job status |
+
+## Links
+
+- [WizPixel Flow](https://flow.wizpixel.com)
+- [Support](mailto:support@wizpixel.com)
+
+## License
+
+MIT