Add sample for filter

libraries/stdlib/samples/test/samples/collections/collections.kt

@@ -803,6 +803,15 @@ class Collections {
     }
 
     class Filtering {
+
+        @Sample
+        fun filter() {
+            val numbers: List<Int> = listOf(1, 2, 3, 4)
+            val evenNumbers = numbers.filter { number -> number.rem(2) == 0 }
+
+            assertPrints(evenNumbers, "[2, 4]")
+        }
+
         @Sample
         fun filterNotNull() {
             val numbers: List<Int?> = listOf(1, 2, null, 4)