Add cargo entity

entities/cargo_entity.cpp

@@ -0,0 +1,21 @@
+#include "cargo_entity.h"
+
+cargo_entity::cargo_entity(const QString &title, int volume) : _title(title), _volume(volume) {
+    this->_id = volume;
+    auto hash = QCryptographicHash::hash(title.toLocal8Bit(), QCryptographicHash::Md5);
+    for (auto bit : hash) {
+        this->_id |= bit;
+    }
+}
+
+unsigned long long cargo_entity::id() {
+    return this->_id;
+}
+
+QString cargo_entity::title() {
+    return this->_title;
+}
+
+unsigned int cargo_entity::volume() {
+    return this->_volume;
+}