Add grid and EVSE meter components with load balancer

components/gridmeter/include/gridmeter.h

@@ -0,0 +1,24 @@
+#ifndef GRIDMETER_H_
+#define GRIDMETER_H_
+
+#include "esp_err.h"
+#include "esp_event_base.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+ESP_EVENT_DECLARE_BASE(GRIDMETER_EVENT);
+
+typedef enum {
+    GRIDMETER_EVENT_UPDATE
+} gridmeter_event_id_t;
+
+esp_err_t gridmeter_init(void);
+esp_err_t gridmeter_read_current(float *current);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRIDMETER_H_ */