Uml node class

docs/node-documentation/NodeClassUml.md

@@ -0,0 +1,43 @@
+### Uml diagram:
+
+``` mermaid
+classDiagram
+
+namespace Esp {
+    class Websockets{
+        +webSocket
+        +_WiFiMulti
+        hexdump()
+        websocketSetup()
+        loop()
+        webSocketEvent()
+        sendMyText()
+    }
+
+    class NodeReadings{
+
+    +TVOC_base, eCO2_base
+    +counter
+    +eCO2
+    +TVOC
+    +interval
+    +temperature
+    +humidity
+    +currentMillis
+    +lastMillis
+    +errorSGP30
+    +errorDHT11
+    +noise        
+
+    setup()
+    loop()
+    resetValues()
+    update()
+    checkForError()
+    displayData()
+
+    }
+
+
+}
+```