Added documentation

docs/node-documentation/TFT-screen.md

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+# TFT screen
+
+
+## Prequesites
+
+To use the TFT screen, you need to install the following libraries:
+
+``` SPI.h , Adafruit_GFX.h, Adafruit_ST7796S_kbv.h ```
+
+
+## Programming the screen
+To program the screen we need to first declare all the pins and give it to the Adafruit_ST7796S_kbv.h library. Then we need to initialize the screen and we can start using it.
+
+```cpp
+#define TFT_CS 14
+#define TFT_DC 13
+#define TFT_RST 12 
+#define MOSI 11
+#define SCK 10
+#define MISO 9
+
+//simplify the name of the library and feed all the correct pins to it
+
+Adafruit_ST7796S_kbv tft = Adafruit_ST7796S_kbv(TFT_CS, TFT_DC, MOSI, SCK, TFT_RST, MISO);
+```
+
+## Drawing on the screen
+
+To draw on the screen we can use the following functions:
+
+```cpp
+tft.fillScreen(0x0000); //clear the screen
+tft.fillRect(0, 0, 240, 240, 0xFFFF); //draw a white rectangle
+tft.fillCircle(120, 120, 50, 0xF800); //draw a red circle
+tft.fillTriangle(0, 0, 240, 240, 0, 240, 0x1F); //draw a blue triangle
+tft.fillRoundRect(0, 0, 240, 240, 10, 0xF81F); //draw a pink rounded rectangle
+tft.drawChar(120, 120, 'A', 0xFFFF, 0x0000, 2); //draw a character
+tft.setTextSize(2); //set the text size
+tft.setTextColor(0xFFFF); //set the text color
+tft.setCursor(0, 0); //set the cursor
+tft.println("Hello World!"); //print a string
+```
+
+To write Hello world on the screen we can use the following code:
+
+```cpp
+tft.fillScreen(0x0000); //clear the screen
+tft.setTextSize(2); //set the text size
+tft.setTextColor(0xFFFF); //set the text color
+tft.setCursor(0, 0); //set the cursor so it starts at the top right, you can also make this other numbers to change the position
+tft.println("Hello World!"); //print a string
+```
+
+To clear the screen for new text you can use the following code:
+
+```cpp
+tft.fillScreen(0x0000); //clear the screen
+```
+