Add simavr example

exampleCode/platform.io-example/MyFancyATmegaProject/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

exampleCode/platform.io-example/MyFancyATmegaProject/platformio.ini

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+; 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:uno]
+platform = atmelavr
+board = uno
+framework = arduino
+
+debug_tool = simavr

exampleCode/platform.io-example/MyFancyATmegaProject/src/main.cpp

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+#include <Arduino.h>
+#include <stdint.h> // intxx_t und uintxx_t als Datentypen
+
+int main(void)
+{
+  uint16_t result = 0;
+
+  // enable ADC
+  ADCSRA |= (1 << ADEN);
+  // Setting the voltage reference to Arduino Input Power
+  ADMUX |= (1<<REFS0);
+  ADMUX &= ~(1<<REFS1);
+  // ADC Frequency should be between 50kHz and 200kHz, Arduiono clock is 16MHz
+  // setup the prescaler to 128 to get ADC Frequency of 16MHz/128 = 125kHz
+  ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1<<ADPS0);
+  // set the ADC channel to ADC0
+  ADMUX &= ~((1<<MUX3)|(1<<MUX2)|(1<<MUX1)|(1<<MUX0));
+  // warmlaufen des ADC mittels "Dummy-Readout"
+  // ADC starten
+  ADCSRA |= (1<<ADSC);
+  // wait till conversion finished 
+  while (ADCSRA & (1<<ADSC)) {}
+  // Preparation finished
+
+  Serial.begin(9600);
+
+  // Start continuous conversion 
+  while (1)
+  {
+    result = 0;
+    // start the conversion
+    ADCSRA |= (1 << ADSC);
+    // wait until it's finished
+    while (ADCSRA & (1<<ADSC)) {}
+    // get the result
+    result = ADCW;
+
+    Serial.print(result);
+    Serial.print("\n");
+    Serial.flush();
+  }
+
+  return 0;
+}