Add NullMarked annotation

Author: pcastornii

src/main/java/com/techsenger/annotations/NullMarked.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2025 Pavel Castornii.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.techsenger.annotations;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ *
+ * @author Pavel Castornii
+ */
+@Documented
+@Retention(RetentionPolicy.CLASS)
+@Target({ElementType.TYPE, ElementType.PACKAGE})
+public @interface NullMarked {
+
+}