pio: start platformIO projects

pio/nrf52/test01/src/main.cpp

@@ -0,0 +1,12 @@
+#include <Arduino.h>
+
+const int ledPin = 17;
+
+void setup() {
+	pinMode(ledPin, OUTPUT);
+	digitalWrite(ledPin, HIGH);
+}
+
+void loop() {
+    // put your main code here, to run repeatedly:
+}