[Project] Add css style skeleton

diff --git a/src/libserver/css/css_style.hxx b/src/libserver/css/css_style.hxx
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+++ b/src/libserver/css/css_style.hxx
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+/*-
+ * Copyright 2021 Vsevolod Stakhov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RSPAMD_CSS_STYLE_HXX
+#define RSPAMD_CSS_STYLE_HXX
+
+#include <memory>
+#include <vector>
+#include "css_rule.hxx"
+#include "css_selector.hxx"
+
+namespace rspamd::css {
+
+/*
+ * Full CSS style representation
+ */
+class css_style {
+public:
+       css_style(const std::shared_ptr<css_style> &_parent) : parent(_parent) {
+               propagate_from_parent ();
+       }
+       css_style(const std::shared_ptr<css_style> &_parent,
+                  const std::vector<std::shared_ptr<css_selector> > &_selectors) : parent(_parent) {
+               selectors.reserve(_selectors.size());
+
+               for (const auto &sel_ptr : _selectors) {
+                       selectors.emplace_back(sel_ptr);
+               }
+
+               propagate_from_parent ();
+       }
+private:
+       std::vector<std::weak_ptr<css_selector> > selectors;
+       std::weak_ptr<css_style> parent;
+       std::vector<css_rule> rules;
+private:
+       void propagate_from_parent(void); /* Construct full style using parent */
+};
+
+}
+
+#endif //RSPAMD_CSS_STYLE_HXX