Create README.md

Signed-off-by: Lorenzo Mangani <[email protected]>

examples/node/README.md

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+# IOx 
+### FlightSQL NodeJS
+Example gRPC Flight SQL API client using NodeJS
+
+#### Usage
+Install and import the [Influxdb3-js library](https://github.com/bonitoo-io/influxdb3-js)
+
+```
+import {InfluxDB} from '@influxdata/influxdb3-client/src'
+
+let url = 'https://eu-central-1-1.aws.cloud2.influxdata.com/';
+let database = 'my-database';
+let token = 'my-token';
+
+let client = new InfluxDB({url: url, database: database, token: token});
+```
+
+### TBD