update project & fix default value add rainfall

resources/js/components/rainfall/AddRainfall.tsx

@@ -7,14 +7,14 @@ const AddRainfall: FC<AddRainfallProps> = ({reload}) => {
 
     const {errorCatch, errorLabel, axiosPost} = useAxiosTools()
     const [date, setDate] = useState((new Date()).toSQLDate())
-    const [value, setValue] = useState(0)
+    const [value, setValue] = useState<null|number>(null)
 
     const handleSubmit = async (event: FormEvent) => {
         event.preventDefault()
         try {
             await axiosPost('/api/rainfalls', {date, value})
             setDate((new Date()).toSQLDate())
-            setValue(0)
+            setValue(null)
             reload(new Date())
         } catch (error) {
             errorCatch(error)