docs: adding main files

subjects/java/checkpoints/almost-palindrom/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(AlmostPalindrome.isAlmostPalindrome("Racedcar"));
+        System.out.println(AlmostPalindrome.isAlmostPalindrome("level"));
+    }
+}

subjects/java/checkpoints/average-calc/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(AverageCalc.average(1,5,1));
+    }
+}

subjects/java/checkpoints/count-char/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(CountChar.count("Hello World !", ' '));
+    }
+}

subjects/java/checkpoints/digitlen/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(Digitlen.digitlen(9989898878));
+    }
+}

subjects/java/checkpoints/factorial/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(Factorial.factorial(3));
+    }
+}

subjects/java/checkpoints/goodbye-mars/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(GoodbyeMars.goodbyeMars());
+    }
+}

subjects/java/checkpoints/multiplication-table/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        MultiplicationTable.generate(5);
+    }
+}

subjects/java/checkpoints/next-prime/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(NextPrime.nextPrime(3));
+    }
+}

subjects/java/checkpoints/reverse-array/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) throws IOException {
+        System.out.println(Arrays.toString(ReverseArray.reverse(new Integer[]{4, 2, 1, 3})));
+    }
+}

subjects/java/checkpoints/rotate-array/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) throws IOException {
+        System.out.println(Arrays.toString(RotateArray.rotate(new Integer[]{4, 2, 1, 3}, 1)));
+    }
+}

subjects/java/checkpoints/sort-array/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) throws IOException {
+        System.out.println(Arrays.toString(SortArray.sort(new Integer[]{4, 2, 1, 3})));
+    }
+}

subjects/java/checkpoints/strlen/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(Strlen.strlen("Hello World !"));
+    }
+}

subjects/java/checkpoints/system-logger/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(SystemLog.systemLog("message"));
+    }
+}

subjects/java/checkpoints/unit-converter/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(UnitConverter.convert(new String[]{"celsius", "fahrenheit", "100"}));
+        System.out.println(UnitConverter.convert(new String[]{"fahrenheit", "celsius", "212"}));
+        System.out.println(UnitConverter.convert(new String[]{"kilometers", "miles", "5"}));
+        System.out.println(UnitConverter.convert(new String[]{"pounds", "kilograms", "10"}));
+        System.out.println(UnitConverter.convert(args));
+    }
+}

subjects/java/checkpoints/universal-greeting/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        System.out.println(UniversalGreeting.greeting("EN"));
+    }
+}