feat(config file): add a config file

include/config.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#define LED_BLINK_TRIGGER_DISABLED 101
+
+/**
+ * @brief parse the config file
+ *
+ * @param path the path to the config file
+ */
+void parse_config_file(char *path);
+
+/**
+ * @brief setup the led formula
+ */
+void setup_led_formula(void);
+
+extern char *battery_status_path;
+extern char *battery_power_source;
+
+extern char *led_brightness_path;
+
+extern unsigned int led_blink_trigger_level;
+extern char *led_blink_timing_formula;
+
+double led_blink_timing_func(int percent);
+
+extern char *acpi_daemon_socket_path;