Add minimal Slave Mode documentation

.gitignore

@@ -0,0 +1,3 @@
+
+examples/.DS_Store
+.DS_Store

examples/3. Others/1-Inkplate_Slave_Mode/1-Inkplate_Slave_Mode.ino

@@ -15,6 +15,9 @@
 
    Learn more about Slave Mode in this update: https://www.crowdsupply.com/e-radionica/inkplate-6/updates/successfully-funded-also-third-party-master-controllers-and-partial-updates
 
+   UART settings are: 115200 baud, standard parity, ending with "\n\r" (both)
+   You can send commands via USB port or by directly connecting to ESP32 TX and RX pins.
+
    Want to learn more about Inkplate? Visit www.inkplate.io
    Looking to get support? Write on our forums: http://forum.e-radionica.com/en/
    15 July 2020 by e-radionica.com

examples/3. Others/1-Inkplate_Slave_Mode/Inkplate_slave_mode_documentation.txt

@@ -1,3 +1,12 @@
+Slave mode for Inkplate 6 by e-radionica.com
+Slave mode is uploaded to each Inkplate 6. It enables you to use the board
+without reprogramming. You just need to send commands via UART and it will
+show contents on its screen. 
+You can send commands via USB port or by directly connecting to ESP32 TX and RX pins.
+
+Settings are:
+115200 baud, standard parity, ending with \n\r
+
 echo:			#?*
 Check if the Inkplate receives commands on UART
 response:		OK
@@ -161,4 +170,4 @@ panelSupply(einkOff/on):#Q(S)*
 S - State of panel power supply (S = 1 -> panel has power supply, S = 0 -> panel power supply has benn turned off)
 
 getPanelState:		#R(?)*
-response:		#R(1)* - panel has power supply or #R(0)* - panel supply has been turned of
+response:		#R(1)* - panel has power supply or #R(0)* - panel supply has been turned off