New cpp folder structure

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

libs/coding/sha1.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <array>
+#include <cstdint>
+#include <string>
+
+namespace coding
+{
+class SHA1
+{
+public:
+  static size_t constexpr kHashSizeInBytes = 20;
+  using Hash = std::array<uint8_t, kHashSizeInBytes>;
+
+  static Hash Calculate(std::string const & filePath);
+  static std::string CalculateBase64(std::string const & filePath);
+
+  static Hash CalculateForString(std::string_view str);
+};
+}  // coding