docs: add contributing.md and agents.md

AGENTS.md

@@ -0,0 +1,33 @@
+It is strongly recommended to disclose your vendor and model (e.g. `GitHub Copilot on GPT 5.6 Sol`)
+in your commit messages and PR description.
+
+Please read @CONTRIBUTING.md in addition to the rules below.
+
+# RE/Decompile Rules
+
+- The contributions must be based on publicly available sources.
+
+# Code Style Rules
+
+- Do not include any assembly or disassembly as code or comment
+- Do not use inline assembly for matching. Any PR with a substantial amount of 
+  inline assembly will be automatically rejected. Even for a small amount, it is
+  preferred to keep the function as non-matching when it's trivially provable
+  that it is equivalent to the original (e.g. register renaming, reordering).
+  - The only exception is `asm("")` which can serve as a barrier for optimization.
+- Do not use `goto` for matching unless it is **absolutely** necessary and plausible
+  that the original source code contained `goto`.
+
+# PR Rules
+
+- English only
+- Do not publish a PR without human review. If the human doesn't know what
+  they are doing, do not create a PR.
+- Do not commit one-off scripts.
+- Do not include any assembly or disassembly as code, comment, commit message or PR description
+- Make the PRs small and focused, which helps review:
+  - One thing per PR
+  - If the change spans across a lot of components, batch them into smaller PRs
+- Squash your branch into one commit.
+- Include an explanation or source for member names or why functions must exist,
+  if it isn't straightforward from the binary or their usages.

CONTRIBUTING.md

@@ -0,0 +1,59 @@
+# Contribution Guidelines
+
+## Development
+
+To build and run checks, please install:
+- [task](https://taskfile.dev) for running commands.
+- CMake (check the version requirement in CMakeLists.txt) and Ninja.
+
+Please run `task clone-deps configure` before running the other
+commands.
+
+Workflows:
+- Run `task configure` to configure the CMake projects.
+- Run `task build` to build and run tests.
+- Run `task check` to check formatting and clang-tidy issues. `task fix` formats the files.
+- Run `task pr` to run the same checks that the PR runs.
+  It's a good idea to always run this one before you open or update a PR.
+
+If there are errors after merging upstream updates, run `task clean clone-deps`
+to clean CMake cache and update your local dependencies. If the error
+persists, please ask for help in Discord.
+
+## Repo Structure
+
+- `/lib/*`: One CMake subdirectory for each library target that gets statically linked into the game.
+- `/test`: Test projects.
+
+## Module Structure
+
+Each SDK module is its own CMake subdirectory at `/lib/` and has its own `include` and `src`
+directories. For example for the module `atk`:
+
+```
+lib/atk/
+├── include/nn/
+│   ├── atk/
+│   └── atk.h
+├── src/atk/
+│   └── atk_Something.cpp
+└── CMakeLists.txt
+```
+
+The public header structure in `lib/*/include/nn` should follow the [same rules as nnSdk headers](https://github.com/open-ead/nnsdk/blob/main/CONTRIBUTING.md).
+
+If there needs to be a new module, you can copy one of the existing modules
+and rename the CMake target in `lib/*/CMakeLists.txt`. Then, add the new module
+in the following places:
+- `/CMakeLists.txt`: Add a `add_subdirectory` near the end of the file.
+- `/Taskfile.yml`: Add it to the `MODULES` list near the top of the file.
+- `/test/header_check/CMakeLists.txt`: Add it to the `HEADER_CHECK_TARGETS` list.
+
+## PR Rules
+
+Please use English for PRs and squash your branch into one commit.
+Keep PRs reasonably sized to get them reviewed faster. If there are multiple
+things in the same PR, consider splitting them into multiple PRs.
+
+If it isn't straightforward from the usage or binary why something must be added,
+please include an explanation or source.

README.md

@@ -6,18 +6,10 @@ This repository includes:
 Do not ask for or PR any copyrighted material to this repo. You will be ignored.
 Usage of the materials here outside of matching decompilation is not supported.
 
-# Credits
+## Credits
  - [Shadow](https://github.com/shadowninja108/) - For [Skyline](https://github.com/shadowninja108/Skyline), which was the primary inspiration and use case for this repo.
  - [Shibbo](https://github.com/shibbo) - For [OdysseyReversed](https://github.com/shibbo/OdysseyReversed/), which most of these headers came from.
 
-# Development
-For running commands please install [task](https://taskfile.dev), CMake, Ninja and Clang/LLVM.
-
-The Clang/LLVM toolchain is only used for formatting and running `clang-tidy`.
-The version should match the [image used in the PR](https://github.com/open-ead/containers/blob/main/ubuntu-builder/Dockerfile)
-
-Before you begin, run `task clone-deps` to clone dependencies.
-
-Run `task pr` to run the same checks that the PR runs. Run `task fix` to fix the clang-format issues.
-
+## Development
 
+Please see [CONTRIBUTING.md](./CONTRIBUTING.md)