ADD: class for priority

include/Whisper/Messages/Priority.hpp

@@ -0,0 +1,59 @@
+#pragma once
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at https://mozilla.org/MPL/2.0/.
+*/
+/** @file */
+/** @copyright 2021 MPLv2 */
+#include <cstdint>
+#include <vector>
+
+/**
+* @brief This is the main namespace for all whisper-com related datatypes and classed.
+*/
+namespace Whisper
+{
+
+  /**
+  * @brief namespace for all data related DataTypes, classes, etc.
+  */
+  namespace Data
+  {
+
+    /**
+    * \defgroup data_classifications Classification of Data within Messages
+    * Data in Message can be classified occording to the non-disclosure of its information.
+    * In whisper-com certain rules are enforced occording to data classification
+    * e.g. messages may be dropped or not routed through gateways.
+    * Furthermore, encryption of data may or may not be enforced.
+    */
+
+
+    /**
+    * @brief Enumeration of different data classifications.
+    * \ingroup data_classifications
+    * Data classifications classify the data within the payload of a message
+    * according to six levels. We think six levels should be enough and
+    * fewer limits the flexibility of the user and more adds to the overall
+    * complexity.
+    */
+    enum class classification : std::uint8_t
+    {
+      /// The data is public and may even be transmitted public to the Internet.
+      PUBLIC,
+      /// The data is classified open. Everyone with access to the network may read it
+      /// but the data is not allowed to be published to the internet or other non local networks.
+      OPEN,
+      /// The data is classified RESTRICTED
+      RESTRICTED,
+      /// the data is classified CONFIDENTIAL
+      CONFIDENTIAL,
+      /// The data is classified as SECRET
+      SECRET,
+      /// The data is classified as TOP SECRET.
+      TOP_SECRET
+    }; // enum class classification
+
+  }; // namespace Data
+
+}; // namespace Whisper