Update README.md

Author: Cormor

README.md

@@ -1,2 +1,28 @@
 # ComposeOverscroll
 Overscroll any scrollable items!
+
+## Preview
+
+https://user-images.githubusercontent.com/21119517/205872216-905bfd0a-e149-4d48-b61e-0a503b87fb08.mp4
+
+
+## How to use
+
+### for column :
+```
+Column(Modifier
+        .fillMaxSize()
+        .overScrollVertical() // invoke before the scrollable Modifier
+        .verticalScroll(rememberScrollState())
+        ) { ... }
+```
+### for scrollable Composable like lazyColumn :
+```
+LazyColumn(Modifier
+            .fillMaxWidth()
+            .height(300.dp)
+            .overScrollVertical() 
+            ) { ... }
+```
+### U can call it nested! pls see the demo!
+