react-native add shahdow code example

Example 1: #react native shadow

shadowColor: '#470000',
        shadowOffset: {width: 0, height: 1},
        shadowOpacity: 0.2,
        elevation: 1

Example 2: box shadow in react native

shadowColor: "#000",
shadowOffset: {
	width: 0,
	height: 4,
},
shadowOpacity: 0,
shadowRadius: 4.65,

elevation: 8,