feat: Add config.h.example for project configuration

config.h.example

@@ -0,0 +1,19 @@
+#pragma once
+
+// -------------------------------------------------------
+// WiFi
+// -------------------------------------------------------
+#define WIFI_SSID     "your_wifi_ssid"
+#define WIFI_PASSWORD "your_wifi_password"
+
+// -------------------------------------------------------
+// API keys
+// -------------------------------------------------------
+#define FINNHUB_API_KEY    "your_finnhub_key"
+#define ALPHAVANTAGE_KEY   "your_alphavantage_key"
+
+// -------------------------------------------------------
+// Timezone  (gmtOffset in seconds, 1=DST observed)
+// -------------------------------------------------------
+#define GMT_OFFSET_SEC      -28800   // UTC-8 (PST)
+#define DAYLIGHT_OFFSET_SEC  3600