Create README.md

Author: debendu-das

Modern Development/ECMASCript 2021/Server-side ECMAScript 2021 examples/filter/README.md

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+## `filter()` Method
+
+The `filter()` method creates a **new array** with all elements that pass the condition implemented by the provided function.
+
+### Syntax
+
+array.filter((element, index, array) {
+  // return true to keep the element, false otherwise
+});