update README.md

@@ -202,6 +202,9 @@ class _HomePageState extends State<HomePage> {
     0.5.sh  //50% of screen height
     0.5.sh  //50% of screen height
     20.setVerticalSpacing  // SizedBox(height: 20 * scaleHeight)
     20.setVerticalSpacing  // SizedBox(height: 20 * scaleHeight)
     20.horizontalSpace  // SizedBox(height: 20 * scaleWidth)
     20.horizontalSpace  // SizedBox(height: 20 * scaleWidth)
+    const RPadding.all(8)   // Padding.all(8.r) - take advantage of const key word
+    REdgeInsts.all(8)       // EdgeInsets.all(8.r)
+    EdgeInsets.only(left:8,right:8).r // EdgeInsets.only(left:8.r,right:8.r).
 ```
 ```
 
 
 #### Adapt screen size：
 #### Adapt screen size：

@@ -161,6 +161,9 @@ class _HomePageState extends State<HomePage> {
     0.5.sh  //屏幕高度的50%
     0.5.sh  //屏幕高度的50%
     20.setVerticalSpacing  // SizedBox(height: 20 * scaleHeight)
     20.setVerticalSpacing  // SizedBox(height: 20 * scaleHeight)
     20.horizontalSpace  // SizedBox(height: 20 * scaleWidth)
     20.horizontalSpace  // SizedBox(height: 20 * scaleWidth)
+    const RPadding.all(8)   // Padding.all(8.r) - take advantage of const key word
+    REdgeInsts.all(8)       // EdgeInsets.all(8.r)
+    EdgeInsets.only(left:8,right:8).r // EdgeInsets.only(left:8.r,right:8.r).
 
 
 ```
 ```
 
 

@@ -151,6 +151,9 @@ class _HomePageState extends State<HomePage> {
     0.5.sh  //50% altura da tela
     0.5.sh  //50% altura da tela
     20.setVerticalSpacing  // SizedBox(height: 20 * scaleHeight)
     20.setVerticalSpacing  // SizedBox(height: 20 * scaleHeight)
     20.horizontalSpace  // SizedBox(height: 20 * scaleWidth)
     20.horizontalSpace  // SizedBox(height: 20 * scaleWidth)
+    const RPadding.all(8)   // Padding.all(8.r) - take advantage of const key word
+    REdgeInsts.all(8)       // EdgeInsets.all(8.r)
+    EdgeInsets.only(left:8,right:8).r // EdgeInsets.only(left:8.r,right:8.r).
 ```
 ```
 
 
 #### Adaptar o tamanho da tela：
 #### Adaptar o tamanho da tela：