Implement basic sensor reading

main.c

@@ -0,0 +1,11 @@
+#define MOISTURE_SENSOR_A0 A0
+
+void setup() {
+    pinMode(MOISTURE_SENSOR_A0, INPUT);
+    Serial.begin(9600);
+}
+
+void loop() {
+    analogRead(MOISTURE_SENSOR_A0);
+    
+}