docs: Add README

Author: epage

README.md

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+# git-fixture
+
+> Reproducible git trees for bug reporting and testing
+
+[![codecov](https://codecov.io/gh/gitext-rs/git-fixture/branch/master/graph/badge.svg)](https://codecov.io/gh/gitext-rs/git-fixture)
+[![Documentation](https://img.shields.io/badge/docs-master-blue.svg)][Documentation]
+![License](https://img.shields.io/crates/l/git-fixture.svg)
+[![Crates Status](https://img.shields.io/crates/v/git-fixture.svg)](https://crates.io/crates/git-fixture)
+
+Dual-licensed under [MIT](LICENSE-MIT) or [Apache 2.0](LICENSE-APACHE)
+
+## Documentation
+
+- [About](#about)
+- [Install](#install)
+- [Getting Started](#getting-started)
+- [Reference](docs/schema.json)
+- [FAQ](#faq)
+- [Contribute](CONTRIBUTING.md)
+- [CHANGELOG](CHANGELOG.md)
+
+## About
+
+
+## Example
+
+
+## Install
+
+[Download](https://github.com/gitext-rs/git-fixture/releases) a pre-built binary
+(installable via [gh-install](https://github.com/crate-ci/gh-install)).
+
+Or use rust to install:
+```bash
+cargo install git-fixture
+```
+
+### Uninstall
+
+See the uninstall method for your installer.
+
+## Getting Started
+
+## FAQ
+
+[Crates.io]: https://crates.io/crates/git-fixture
+[Documentation]: https://docs.rs/git-fixture