Added uml

docs/node-documentation/TFT-screen.md

@@ -67,16 +67,20 @@ We aren't using the cs2 and the pen pin because we arent utilizing the touch fun
 ```mermaid
 classDiagram
 
-writeText <|-- Adafruit_ST7796S_kbv
+displayTex <|-- Adafruit_ST7796S_kbv
-loop <-- writeText
+loop <-- displayTex
 
-class writeText{ 
+class displayTex{ 
     +text
     +color
     +size
     +posx
     +posy
-    +writeText()
+    +void writeText()
+    -int centerText(char* text)
+
+
+
 }
 
 class Adafruit_ST7796S_kbv{