createTicket working, solves #3

cli/json_serializer.cpp

@@ -0,0 +1,23 @@
+#include "include/json_serializer.h"
+
+// Deserialize JSON -> class
+void from_json(const json& j, ticket_t& t) {
+    t.id = j.at("id").get<int>();
+    t.title = j.at("title").get<std::string>();
+    t.description = j.at("description").get<std::string>();
+    t.status = j.at("status").get<std::string>();
+    t.created_at = j.at("created_at").get<std::string>();
+    t.updated_at = j.at("updated_at").get<std::string>();
+}
+
+// Serialize class -> JSON
+void to_json(json& j, const ticket_t& t) {
+    j = json{
+        {"id", t.id},
+        {"title", t.title},
+        {"description", t.description},
+        {"status", t.status},
+        {"created_at", t.created_at},
+        {"updated_at", t.updated_at}
+    };
+}