Add initial implementation of the settler node for Node-RED

- Create package.json to define project metadata and dependencies
- Implement settler.html for the node's UI in Node-RED
- Add settler.js to register the settler node type and handle HTTP requests
- Introduce src/nodeClass.js for the settler node class functionality
- Define src/specificClass.js for settler-specific logic and utilities

src/specificClass.js

@@ -0,0 +1,15 @@
+const { childRegistrationUtils, logger, MeasurementContainer } = require('generalFunctions');
+const EventEmitter = require('events');
+
+class Settler {
+  constructor(config) {
+    this.config = config;
+    // EVOLV stuff
+    this.logger = new logger(this.config.general.logging.enabled, this.config.general.logging.logLevel, config.general.name);
+    this.emitter = new EventEmitter();
+    this.measurements = new MeasurementContainer();
+    this.childRegistrationUtils = new childRegistrationUtils(this); // Child registration utility
+  }
+}
+
+module.exports = { Settler };