Initial commit with action

documentation/api_doc.md

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+## Sensor data API
+{
+  "voltage": 12.43,
+  "current": 15.2732,
+  "error_code": 2,
+  "level_percent":73.843,
+  "level_cm": 281.3,
+ "top_level_cm": 281.3,
+ "bottom_level_cm": 281.3,
+  "liter": 24000
+}

documentation/error_codes.md

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+## Error codes
+1. Voltage Low
+2. Voltage High
+3. Current low
+4. Current high
+
+else if (voltage_low) {
+      display_error_code(1);
+    } else if (voltage_high){
+      display_error_code(2);
+    } else if (current_low) {
+      display_error_code(3);
+    } else if (current_high){
+      display_error_code(4);
+    }