doc: initial port of README

Signed-off-by: Brian McGee <brian@bmcgee.ie>

README.md

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+<h1 align="center">
+  <br>
+  <img src="docs/public/logo.svg" alt="logo" width="200">
+  <br>
+  treefmt — one CLI to format your repo
+  <br>
+  <br>
+</h1>
+
+[![Support room on Matrix](https://img.shields.io/matrix/treefmt:numtide.com.svg?label=%23treefmt%3Anumtide.com&logo=matrix&server_fqdn=matrix.numtide.com)](https://matrix.to/#/#treefmt:numtide.com)
+
+**Status: beta**
+
+`treefmt` streamlines the process of applying formatters to your project, making it a breeze with just one command line.
+
+## Motivation
+
+It’s common to format code according to the project’s standards before making contributions to any project. This task
+seems trivial at first sight — you can set up the required language formatter in your IDE.
+
+However, contributing to multiple projects requires more effort: you must change your formatter configurations each
+time you switch between projects or call them manually.
+
+Formatting requires less effort if a universal formatter for multiple languages, which is also project-specific, is in
+place.
+
+## About treefmt
+
+`treefmt` runs all your formatters with one command. It’s easy to configure and fast to execute.
+
+![Treefmt Init](./docs/public/init.gif)
+
+Its main features are:
+
+-   **Providing a unified CLI and output**
+    -   You don’t need to remember which formatters are necessary for each project.
+        Once you specify the formatters in the config file, you can trigger all of them with one command and get a
+        standardized output.
+-   **Running all the formatters in parallel**
+    -   A standard script loops over your folders and runs each formatter
+        consequentially. In contrast, `treefmt` runs formatters in parallel. This way, the formatting job takes less time.
+-   **Tracking file changes**
+    -   When formatters are run in a script, they process all the files they encounter, no matter
+        whether the code has changed. This unnecessary work can be eliminated if only the changed files are formatted.
+        `treefmt` caches the changed files and marks them for re-formatting.
+
+To reformat the whole source tree, just type `treefmt` in any folder. This is a fast and simple formatting solution.
+
+## Installation
+
+You can install `treefmt` by downloading the binary. Find the binaries for different architectures [here](https://github.com/numtide/treefmt.go/releases).
+Otherwise, you can install the package from source code — either with [Go](https://go.dev/), or with the help of [nix](https://github.com/NixOS/nix).
+
+We describe the installation process in detail in the [docs](https://numtide.github.io/treefmt.go/).
+
+## Usage
+
+In order to use `treefmt` in your project, make sure the config file `treefmt.toml` is present in the root folder and
+is edited to suit your needs.
+
+You can generate it with:
+
+```
+$ treefmt --init
+```
+
+You can then run `treefmt` in your project root folder like this:
+
+```
+$ treefmt
+```
+
+To explore the tool’s flags and options, type:
+
+```console
+$ treefmt --help
+```
+
+Additionally, there's a wrapper called [`treefmt-nix`](https://github.com/numtide/treefmt.go-nix) for using `treefmt` with [`nix`](https://github.com/NixOS/nix).
+
+## Configuration
+
+Formatters are specified in the config file `treefmt.toml`, which is usually located in the project root folder. The
+generic way to specify a formatter is like this:
+
+```
+[formatter.<name>]
+command = "<formatter-command>"
+options = ["<formatter-option-1>"...]
+includes = ["<glob>"]
+```
+
+For example, if you want to use [nixpkgs-fmt](https://github.com/nix-community/nixpkgs-fmt) on your Nix project and rustfmt on your Rust project, then
+`treefmt.toml` will look as follows:
+
+```toml
+[formatter.nix]
+command = "nixpkgs-fmt"
+includes = ["*.nix"]
+
+[formatter.rust]
+command = "rustfmt"
+options = ["--edition", "2018"]
+includes = ["*.rs"]
+```
+
+Before specifying the formatter in the config, make sure it’s installed.
+
+To find and share existing formatter recipes, take a look at the [docs](https://numtide.github.io/treefmt.go/).
+
+If you are a Nix user, you might also be interested in [treefmt-nix](https://github.com/numtide/treefmt.go-nix) to use Nix to configure and bring in
+formatters.
+
+## Compatibility
+
+`Treefmt` works with any formatter that adheres to the [following specification](https://github.com/numtide/treefmt.go/blob/main/docs/formatters-spec.md).
+
+For instance, you can go for:
+
+-   [clang-format](https://clang.llvm.org/docs/ClangFormat.html) for C/C++/Java/JavaScript/JSON/Objective-C/Protobuf/C#
+-   gofmt for Golang
+-   Prettier for JavaScript/HTML/CSS
+
+Find the full list of supported formatters [here](https://numtide.github.io/treefmt.go/formatters).
+
+## Upcoming features
+
+This project is still pretty new. Down the line we also want to add support for:
+
+-   IDE integration
+-   Pre-commit hooks
+
+## Related projects
+
+-   [EditorConfig](https://editorconfig.org/): unifies file indentations configuration on a per-project basis.
+-   [prettier](https://prettier.io/): an opinionated code formatter for a number of languages.
+-   [Super-Linter](https://github.com/github/super-linter): a project by GitHub to lint all of your code.
+-   [pre-commit](https://pre-commit.com/): a framework for managing and maintaining multi-language pre-commit hooks.
+
+## Contributing
+
+All contributions are welcome! We try to keep the project simple and focused. Please refer to the [Contributing](./docs/contributing.md)
+guidelines for more information.
+
+## Commercial support
+
+Looking for help or customization?
+
+Get in touch with [Numtide](https://numtide.com/) to get a quote. We make it easy for companies to work with Open
+Source projects: <https://numtide.com/contact>
+
+## License
+
+Unless explicitly stated otherwise, any contribution intentionally submitted for inclusion will be licensed under the
+[MIT license](LICENSE.md) without any additional terms or conditions.