Added example code tu turn leds off, for resetting the state

firmware/examples/LED-OFF/.vscode/arduino.json

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+{
+    "board": "espressif:esp32:nina_w10",
+    "configuration": "UploadSpeed=115200",
+    "port": "/dev/ttyUSB0",
+    "sketch": "LED-OFF.ino"
+}

firmware/examples/LED-OFF/.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+            ],
+            "browse": {
+                "limitSymbolsToIncludedHeaders": false,
+                "path": [
+                    "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+                ]
+            },
+            "intelliSenseMode": "clang-x64",
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17"
+        }
+    ],
+    "version": 4
+}

firmware/examples/LED-OFF/LED-OFF.ino

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+/* 
+* LED siren example for MakeZurich badge 2018
+*/
+#define FASTLED_ALLOW_INTERRUPTS 0
+#include "FastLED.h"
+
+#define NUM_LEDS 2
+#define DATA_PIN 27 // GPIO18
+
+// Define the array of leds
+CRGB leds[NUM_LEDS];
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("\n\nTurn LEDs off");
+  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
+}
+
+void loop() {
+  ledOff();
+  delay(5000);
+}
+
+void ledOff() {
+  leds[0] = CRGB::Black;
+  leds[1] = CRGB::Black;
+  FastLED.show();
+}

firmware/examples/LED-OFF/README.md

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+# LED OFF
+
+Turns off both LEDs on the MakeZurich badge 2018 to reset in case a new programm will be flashed that does not set the LED state hence they keep the last state.