New cpp folder structure

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

libs/platform/platform_unix_impl.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <functional>
+#include <string>
+#include <vector>
+
+namespace pl
+{
+void EnumerateFiles(std::string const & directory, std::function<void(char const *)> const & fn);
+
+void EnumerateFilesByRegExp(std::string const & directory, std::string const & regexp,
+                            std::vector<std::string> & res);
+}  // namespace pl