Add README

Author: memosworld

README.md

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+# Custom Validation Annotations for Spring Boot
+
+This repository provides a collection of custom validation annotations for use with Spring Boot applications. These
+annotations help you enforce specific validation rules in your application by adding meaningful constraints (even though
+some of them are just for fun) to your data models.
+
+## Custom Validation Annotations
+
+### Age
+
+The `@Age` annotation ensures that a `LocalDate` field represents an age within a specified range.
+
+### AtLeastOneNotBlank
+
+The `@AtLeastOneNotBlank` annotation validates whether at least one of the specified fields is not blank (non-empty).
+
+### ExcludedNumbers
+
+The `@ExcludedNumbers` annotation checks that a field's value is not one of the specified excluded numbers.
+
+### Fibonacci
+
+The `@Fibonacci` annotation validates whether a field's value is a number within the Fibonacci series.
+
+### IntegerValues
+
+The `@IntegerValues` annotation ensures that a field's value is one of the specified integer values.
+
+### ISO3166CountryCode
+
+The `@ISO3166CountryCode` annotation checks whether a field's value represents a valid ISO 3166-1 country code (either
+alpha-2 or alpha-3).