docs: added JavaDoc

property-guard-spring-boot-starter/src/main/java/com/onixbyte/propertyguard/autoconfiguration/PropertyGuard.java

@@ -70,6 +70,12 @@ import java.util.Optional;
  */
 public class PropertyGuard implements EnvironmentPostProcessor {
 
+    /**
+     * Create a {@link PropertyGuard} instance.
+     */
+    public PropertyGuard() {
+    }
+
     /**
      * Process the encryption environment variables.
      *