adding arduino examples for DHT11, blink, and temperature sensor

week3/examples/Projects/TemperatureSensor/platformio.ini

@@ -0,0 +1,20 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+framework = arduino
+board_build.core = earlephilhower
+
+[env:pico]
+board = pico
+lib_deps = 
+	paulstoffregen/OneWire@^2.3.8
+	milesburton/DallasTemperature@^4.0.6