Add DataFrame

Author: vincentlaucsb

.claude/rules/testing-conventions.md

@@ -1,3 +1,8 @@
+---
+paths:
+  - "tests/**/*"
+---
+
 # Testing Conventions for AI Agents
 
 ## Rule: Tests Should Expose Bugs, Not Assert Them

.gitignore

@@ -1,5 +1,6 @@
 # Custom Settings
 CMakeLists2.txt
+.personal-todo.md
 
 # Build
 bin/

include/csv.hpp

@@ -29,6 +29,7 @@ SOFTWARE.
 #ifndef CSV_HPP
 #define CSV_HPP
 
+#include "internal/data_frame.hpp"
 #include "internal/csv_reader.hpp"
 #include "internal/csv_stat.hpp"
 #include "internal/csv_utility.hpp"