docs: adding subject and main

subjects/java/checkpoints/breakdown-url/ExerciseRunner.java

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+import java.util.Map;
+
+public class ExerciseRunner {
+    public static void main(String[] args) {
+        UrlParser parser = new UrlParser();
+
+        // Test case 1
+        String url1 = "https://www.example.com:8080/path?name=value";
+        Map<String, String> components1 = parser.parseURL(url1);
+        System.out.println("Components of URL 1: " + components1);
+
+        // Test case 2
+        String url2 = "http://example.com/";
+        Map<String, String> components2 = parser.parseURL(url2);
+        System.out.println("Components of URL 2: " + components2);
+
+    }
+}

subjects/java/checkpoints/breakdown-url/README.md

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+## URL Parsing
+
+### Instructions
+
+Create a class `UrlParser` that provides a method to parse and validate URLs using regex. The method should extract and return url components the `protocol`, `domain`, `port`, `path` and `query` parameters. The URL is always correct.
+
+> give back in the map just the existing component.
+
+### Expected Class
+
+```java
+public class UrlParser {
+    public Map<String, String> parseURL(String url) {
+        // Implementation to parse and validate URLs using regex
+    }
+}
+```
+
+### Usage
+
+Here is a possible `ExerciseRunner.java` to test your class:
+
+```java
+import java.util.Map;
+
+public class ExerciseRunner {
+    public static void main(String[] args) {
+        UrlParser parser = new UrlParser();
+
+        // Test case 1
+        String url1 = "https://www.example.com:8080/path?name=value";
+        Map<String, String> components1 = parser.parseURL(url1);
+        System.out.println("Components of URL 1: " + components1);
+
+        // Test case 2
+        String url2 = "http://example.com/";
+        Map<String, String> components2 = parser.parseURL(url2);
+        System.out.println("Components of URL 2: " + components2);
+
+    }
+}
+```
+
+### Expected Output
+
+```shell
+$ javac *.java -d build
+$ java -cp build ExerciseRunner
+Components of URL 1: {protocol=https, domain=www.example.com, port=8080, path=/path, query=name=value}
+Components of URL 2: {protocol=http, domain=example.com, path=/}
+$
+```
+
+This exercise guides the students in creating a method to parse and validate URLs using regex. It includes class definition, method signature, and usage example with expected output.