Add README with usage and install instructions

README.md

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+# node-red-odbcwritenow
+
+Node-RED node for accessing MYOB data via **ODBCWriteNow**. Useful when you want AccountRight-style ODBC-style reads/writes in Node-RED without wrangling the raw HTTP yourself.
+
+## Features
+- Node-RED palette node that talks to ODBC WriteNow
+- Read/write operations against MYOB AccountRight via the ODBC WriteNow API
+- Simple config for credentials and endpoint base URL
+
+## Prerequisites
+- Node-RED ≥ 4.x installed and running
+- An active **ODBC WriteNow** account + API key
+
+## Install
+
+```bash
+# install into your Node-RED user dir
+cd ~/.node-red
+npm install DarkAxi0m/node-red-odbcwritenow
+```
+
+Restart Node-RED.
+
+If you manage Node-RED as a service:
+```bash
+sudo systemctl restart nodered
+```
+
+## Usage
+
+1. In the Node-RED editor, open the palette and drag **ODBC WriteNow** onto your flow.
+2. Double-click the node and set:
+   - **Base URL**: your ODBC WriteNow endpoint (e.g. `https://myobsync.accede.com.au/`)
+   - **API Key**: your issued key
+   - **Operation/Path**: API route you need (e.g. download/upload endpoints per docs)
+   - **Params/Body**: any query/body fields required for your action
+
+Refer to the ODBC WriteNow developer docs for the exact routes and parameters.
+
+Example (generic pattern):
+```text
+GET /api/download?table=Customers&updatedSince=2024-01-01
+POST /api/upload  (JSON body with rows)
+```
+
+## License
+ISC © Accede Holdings PTY LTD. See `LICENSE`.
+
+## Links
+- Repo: [DarkAxi0m/node-red-odbcwritenow](https://github.com/DarkAxi0m/node-red-odbcwritenow)
+- [ODBC WriteNow – Overview & pricing](https://odbcwritenow.com/)
+- [ODBC WriteNow – Developer docs](https://odbcwritenow.com/developers/)