added README

README.md

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+# Borrow System ESP32 - Firmware
+
+This is the firmware for the ESP32 built into the locker. The credentials should be specified in config.h. 

config.h

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+// config.h - Private configuration file
+// This file contains sensitive information and should NOT be committed to git
+
+#ifndef CONFIG_H
+#define CONFIG_H
+
+// WiFi credentials
+const char* WIFI_SSID = "MCS-BYOD";
+const char* WIFI_PASSWORD = "mcs-By0D";
+
+// Backend API configuration
+const char* BACKEND_URL = "https://insta.the1s.de/backend/api";
+const char* API_KEY = "82761286"; // Replace with your 8-digit API key
+
+#endif // CONFIG_H