Add new Streams concept with intro and resources

concepts/streams/about.md

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+# About Streams
+
+Java Streams provide a functional, declarative approach to processing collections of data.
+
+Instead of writing explicit loops, Streams let you build **pipelines** of operations — transforming data step-by-step in a clean, readable way.
+
+---
+
+### Creating Streams
+Streams can be created from collections, arrays, or I/O channels:
+```java
+List<Integer> numbers = List.of(1, 2, 3, 4, 5);
+Stream<Integer> stream = numbers.stream();

concepts/streams/config.json

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+{
+  "blurb": "Learn how to use Java Streams for functional and declarative data processing.",
+  "authors": ["Zaildar_Anmol"],
+  "contributors": [],
+  "forked_from": null
+}

concepts/streams/introduction.md

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+# Introduction
+
+The `Stream` API, introduced in Java 8, provides a modern, functional way to process data.
+
+A **Stream** is a sequence of elements that supports operations like filtering, mapping, and reducing.  
+It allows you to transform and analyze collections without using traditional loops.
+
+Example:
+```java
+import java.util.*;
+import java.util.stream.*;
+
+public class Example {
+    public static void main(String[] args) {
+        List<String> names = List.of("Arjun", "Riya", "Sam", "Aman");
+
+        names.stream()
+             .filter(n -> n.startsWith("A"))
+             .map(String::toUpperCase)
+             .forEach(System.out::println);
+    }
+}