Add integration instructions and example for Qt Creator

examples/ide/qtcreator/platformio.ini

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+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[env:arduino_uno]
+platform = atmelavr
+framework = arduino
+board = uno

examples/ide/qtcreator/platformio.pro

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+win32 {
+    HOMEDIR += $$(USERPROFILE)
+}
+else {
+    HOMEDIR += $$(PWD)
+}
+
+INCLUDEPATH += "$$HOMEDIR/.platformio/packages/framework-arduinoavr/cores/arduino"
+INCLUDEPATH += "$$HOMEDIR/.platformio/packages/toolchain-atmelavr/avr/include"
+
+win32:INCLUDEPATH ~= s,/,\\,g
+
+# DEFINES += __AVR_ATmega328__
+
+OTHER_FILES += \
+    platformio.ini
+
+SOURCES += \
+    src/main.c

examples/ide/qtcreator/src/main.c

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+#include "Arduino.h"
+/*
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+ 
+  This example code is in the public domain.
+*/
+ 
+int led = 1; // blink 'digital' pin 1 - AKA the built in red LED
+
+// the setup routine runs once when you press reset:
+void setup() {
+  // initialize the digital pin as an output.
+  pinMode(led, OUTPUT);
+
+}
+
+// the loop routine runs over and over again forever:
+void loop() {
+    digitalWrite(led, HIGH); 
+    delay(1000);
+    digitalWrite(led, LOW);
+    delay(1000);
+}
+