[docs] Add human-in-the-loop policy for tool-assisted contributions (#154441)

Over the course of 2025, we observed an increase in the volume of
LLM-assisted nuisance contributions to the project. Nuisance
contributions have always been an issue for open-source projects, but
until LLMs, we made do without a formal policy banning such
contributions. However, LLMs are here, so we are adopting this policy,
abbreviated as "human in the loop", which requires that every
contribution has a human author attesting to the value of that
contribution, and that it is high enough quality that it is worth the
time it takes to review the contribution.

This policy evolved over time based on community input from the
following Discourse threads and a few area team and LLVM project council
meetings:
* [Our AI policy vs code of conduct and vs
reality](https://discourse.llvm.org/t/our-ai-policy-vs-code-of-conduct-and-vs-reality/88300)
* [[RFC] LLVM AI tool policy: start small, no slop](https://discourse.llvm.org/t/rfc-llvm-ai-tool-policy-start-small-no-slop/88476)
* [[RFC] LLVM AI tool policy: human in the
loop](https://discourse.llvm.org/t/rfc-llvm-ai-tool-policy-human-in-the-loop/89159)

---------

Co-authored-by: Hubert Tong <hubert.reinterpretcast@gmail.com>
Co-authored-by: maflcko <6399679+maflcko@users.noreply.github.com>
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  36. CODE_OF_CONDUCT.md
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  38. LICENSE.TXT
  39. pyproject.toml
  40. README.md
  41. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.

C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

Getting the Source Code and Building LLVM

Consult the Getting Started with LLVM page for information on building and running LLVM.

For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

Getting in touch

Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.

The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.