New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/indexer/fake_feature_ids.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <cstdint>
+#include <limits>
+
+// Before creating new fake feature interval note that routing has 
+// it's own fake features in routing/fake_feature_ids.hpp
+
+namespace feature
+{
+struct FakeFeatureIds
+{
+  static bool IsEditorCreatedFeature(uint32_t id)
+  {
+    return id >= kEditorCreatedFeaturesStart;
+  }
+
+  static uint32_t constexpr k20BitsOffset = 0xfffff;
+  static uint32_t constexpr kEditorCreatedFeaturesStart =
+      std::numeric_limits<uint32_t>::max() - k20BitsOffset;
+};
+}  // namespace feature