[WIP] Add cross-platform C++ competitive programming repository files

[Copilot]

• Create directory structure (src/, templates/, scripts/, include/, tests/)
• Create src/template.cpp with fast I/O and competitive programming macros
• Create scripts/setup.sh for installing dependencies (g++, clang++, make, gdb, lldb)
• Create scripts/cf command-line tool with two functions:
  • cf template NAME - creates folder/file with template and compiles
  • cf NAME [input.txt] - compiles/runs cpp with input
• Create build.sh script for building projects
• Create Makefile for building projects
• Update README.md with comprehensive documentation
• Add .gitignore to exclude build artifacts
• Test the setup on the current environment

Original prompt

Create a cross-platform C++ competitive programming repo with src/, templates/, scripts/, include/, tests/. Add scripts/setup.sh to install g++/clang++, make, gdb/lldb, fast I/O, editors. Add scripts/cf: cf template NAME creates folder/file with template and compiles; cf NAME [input.txt] compiles/runs cpp with input. Include src/template.cpp (fast I/O + macros), build.sh/Makefile, README. Fully portable and ready-to-run.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.