docs: adding subject and main

subjects/java/checkpoints/is-anagram/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        AnagramChecker checker = new AnagramChecker();
+
+        // Test cases
+        System.out.println(checker.isAnagram("listen", "silent")); // Expected output: true
+        System.out.println(checker.isAnagram("triangle", "integral")); // Expected output: true
+        System.out.println(checker.isAnagram("apple", "pale")); // Expected output: false
+        System.out.println(checker.isAnagram("Astronomer", "Moon starer")); // Expected output: true
+    }
+}

subjects/java/checkpoints/is-anagram/README.md

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+## Is Anagram 
+
+### Instructions
+
+Create a class `AnagramChecker` that provides a method to check if two strings are anagrams. An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.
+
+### Expected Class
+
+```java
+public class AnagramChecker {
+    public boolean isAnagram(String str1, String str2) {
+        // Implementation to check if str1 and str2 are anagrams
+    }
+}
+```
+
+### Usage
+Here is a possible ExerciseRunner.java to test your class:
+
+```java
+public class ExerciseRunner {
+    public static void main(String[] args) {
+        AnagramChecker checker = new AnagramChecker();
+
+        // Test cases
+        System.out.println(checker.isAnagram("listen", "silent")); // Expected output: true
+        System.out.println(checker.isAnagram("triangle", "integral")); // Expected output: true
+        System.out.println(checker.isAnagram("apple", "pale")); // Expected output: false
+        System.out.println(checker.isAnagram("Astronomer", "Moon starer")); // Expected output: true
+    }
+}
+```
+
+### Expected Output
+```shell
+$ javac *.java -d build
+$ java -cp build ExerciseRunner
+true
+true
+false
+true
+$
+```