New cpp folder structure

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

libs/search/base/text_index/text_index.cpp

@@ -0,0 +1,21 @@
+#include "search/base/text_index/text_index.hpp"
+
+#include "base/assert.hpp"
+#include "base/string_utils.hpp"
+
+using namespace std;
+
+namespace search_base
+{
+string DebugPrint(TextIndexVersion const & version)
+{
+  switch (version)
+  {
+  case TextIndexVersion::V0: return "V0";
+  }
+  string ret =
+      "Unknown TextIndexHeader version: " + strings::to_string(static_cast<uint8_t>(version));
+  ASSERT(false, (ret));
+  return ret;
+}
+}  // namespace search