Kintsugi: Add readme and contributing files.

CONTRIBUTING.md

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+# Contributing
+
+If you wish to contribute to the project, please follow the guidelines below.
+
+## Opening issues
+
+- Check that the issue doesn't exist already.
+- Check that the issue was not already fixed in the latest `main`.
+
+## Pull requests
+
+**During development**
+
+- Make sure you're on the latest version to avoid conflicts when opening the pull request.
+- Install the needed gems by running `bundle install`.
+- Make the changes you need and commit them.
+- Add tests for the new functionality.
+- Run `bundle exec rake` and make sure all the tests pass.
+
+**Before opening a pull request:**
+
+- Squash the commits such that each represents a single coherent change. Make sure that they have [good commit messages](https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
+- Open a [pull request](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests).

README.md

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+<p align="center">
+  <img src="./logo/kintsugi.png" alt="Kintsugi Logo"/>
+</p>
+
+# Kintsugi [![Ruby Style Guide](https://img.shields.io/badge/code_style-rubocop-brightgreen.svg)](https://github.com/rubocop/rubocop)
+
+## What is this?
+
+One of the frustrations of working with Xcode together with Git is resolving conflicts in Xcode project files, i.e. the `project.pbxproj` file.
+
+Kintsugi sets out to solve this exact problem: Automatically resolving Git merge conflicts occurring in `.pbxproj` files.
+
+The end goal is for the tool to succeed 99.9% of the time, and let you resolve the real conflicts in a convenient way the rest of the time.
+
+> Kintsugi (金継ぎ) is the art of repairing broken pottery by mending it with gold. [Wikipedia](http://en.wikipedia.org/wiki/Kintsugi)
+
+## How?
+
+Kintsugi understands the changes you've made to the `.pbxproj` file, so it simply resets the conflicts and re-applies those changes to it.
+
+From a technical perspective, Kintsugi heavily relies on [Xcodeproj](https://github.com/CocoaPods/Xcodeproj). It uses its diff capability to extract the changes, and uses its project files editing capabilities to apply the changes.
+
+## Installing Kintsugi
+
+```sh
+$ gem install kintsugi
+```
+
+If you prefer to use bundler, add the following line to your Gemfile:
+
+```rb
+gem 'kintsugi', require: false
+```
+
+## Usage
+
+When there's a `.pbxproj` file with Git conflicts, run `kintsugi <path_to_pbxproj_file>`.
+
+And see the magic happen! :sparkles:
+
+## Contribution
+
+See our [Contribution guidelines](./CONTRIBUTING.md).
+
+## Alternatives
+
+- [XcodeGen](https://github.com/yonaskolb/XcodeGen): You can commit this JSON file into Git instead of the `.pbxproj` file. Then resolving conflicts is much easier.
+
+## Copyright
+
+Copyright (c) 2021 Lightricks. See [LICENSE](./LICENSE) for details.