init commit

Signed-off-by: YoungSoo Shin <shinys000114@gmail.com>

main/service/datalog.h

@@ -0,0 +1,10 @@
+#ifndef MAIN_SERVICE_DATALOG_H_
+#define MAIN_SERVICE_DATALOG_H_
+
+#include <stdint.h>
+
+void datalog_init(void);
+void datalog_add(uint32_t timestamp, float voltage, float current, float power);
+const char* datalog_get_path(void);
+
+#endif /* MAIN_SERVICE_DATALOG_H_ */