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CON-2557-Markdown-Reverse-Array-exercise (#2527)

* docs: adding subject

* docs: rephrase exercice description to improve its clarity

---------

Co-authored-by: amine <aaitihia@leyton.com>
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  1. 39
      subjects/java/checkpoints/reverse-array/README.md

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subjects/java/checkpoints/reverse-array/README.md

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## ReverseArray
### Instructions
Create a Java file named `ReverseArray.java` and define a function named `reverse` inside it. This function should take an array as input, reverse the order of its elements, and return the new reversed array.
### Expected Functions
```java
public class ReverseArray {
public static Integer[] reverse(Integer[] arr) {
// your code here
}
}
```
### Usage
Here is a possible `ExerciseRunner.java` to test your function :
```java
import java.io.*;
import java.util.Arrays;
public class ExerciseRunner {
public static void main(String[] args) throws IOException {
System.out.println(Arrays.toString(ReverseArray.reverse(new Integer[]{4, 2, 1, 3})));
}
}
```
and its output :
```shell
$ javac *.java -d build
$ java -cp build ExerciseRunner
[3, 1, 2, 4]
$
```
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