Initial implementation

README.md

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+# install-action
+
+[![build status](https://img.shields.io/github/workflow/status/taiki-e/install-action/CI/main?style=flat-square&logo=github)](https://github.com/taiki-e/install-action/actions)
+
+GitHub Action for installing development tools (mainly from GitHub Releases).
+
+- [Usage](#usage)
+  - [Inputs](#inputs)
+  - [Example workflow](#example-workflow)
+- [Supported tools](#supported-tools)
+- [Security](#security)
+- [Related Projects](#related-projects)
+- [License](#license)
+
+## Usage
+
+### Inputs
+
+| Name | Required | Description | Type | Default |
+| ---- |:--------:| ----------- | ---- | ------- |
+| tool | **true** | Tools to install (comma-separated list) | String | |
+
+### Example workflow
+
+```yaml
+- uses: taiki-e/install-action@v1
+  with:
+    tool: cargo-hack
+```
+
+You can use the shorthand (if you do not need to pin the versions of this action and the installed tool):
+
+```yaml
+- uses: taiki-e/install-action@cargo-hack
+```
+
+To install a specific version, use `@version` syntax:
+
+```yaml
+- uses: taiki-e/install-action@v1
+  with:
+    tool: cargo-hack@0.5.9
+```
+
+To install multiple tools:
+
+```yaml
+- uses: taiki-e/install-action@v1
+  with:
+    tool: cargo-hack,cargo-minimal-versions
+```
+
+Or:
+
+```yaml
+- uses: taiki-e/install-action@cargo-hack
+- uses: taiki-e/install-action@cargo-minimal-versions
+```
+
+## Supported tools
+
+<!--
+License should use SPDX license identifiers.
+https://spdx.org/licenses
+-->
+
+| Name | Where binaries will be installed | Where will it be installed from | Supported platform | License |
+| ---- | -------------------------------- | ------------------------------- | ------------------ | ------- |
+| [**cargo-hack**](https://github.com/taiki-e/cargo-hack) | `~/.cargo/bin` | [GitHub Releases](https://github.com/taiki-e/cargo-hack/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/taiki-e/cargo-hack/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/taiki-e/cargo-hack/blob/HEAD/LICENSE-MIT) |
+| [**cargo-llvm-cov**](https://github.com/taiki-e/cargo-llvm-cov) | `~/.cargo/bin` | [GitHub Releases](https://github.com/taiki-e/cargo-llvm-cov/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/taiki-e/cargo-llvm-cov/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/taiki-e/cargo-llvm-cov/blob/HEAD/LICENSE-MIT) |
+| [**cargo-minimal-versions**](https://github.com/taiki-e/cargo-minimal-versions) | `~/.cargo/bin` | [GitHub Releases](https://github.com/taiki-e/cargo-minimal-versions/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/taiki-e/cargo-minimal-versions/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/taiki-e/cargo-minimal-versions/blob/HEAD/LICENSE-MIT) |
+| [**parse-changelog**](https://github.com/taiki-e/parse-changelog) | `~/.cargo/bin` | [GitHub Releases](https://github.com/taiki-e/parse-changelog/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/taiki-e/parse-changelog/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/taiki-e/parse-changelog/blob/HEAD/LICENSE-MIT) |
+| [**cross**](https://github.com/rust-embedded/cross) | `~/.cargo/bin` | [GitHub Releases](https://github.com/rust-embedded/cross/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/rust-embedded/cross/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/rust-embedded/cross/blob/HEAD/LICENSE-MIT) |
+| [**shellcheck**](https://www.shellcheck.net) | `/usr/local/bin` | [GitHub Releases](https://github.com/koalaman/shellcheck/releases) | Linux, macOS | [GPL-3.0-or-later](https://github.com/koalaman/shellcheck/blob/HEAD/LICENSE) |
+| [**shfmt**](https://github.com/mvdan/sh) | `/usr/local/bin` | [GitHub Releases](https://github.com/mvdan/sh/releases) | Linux, macOS | [BSD-3-Clause](https://github.com/mvdan/sh/blob/HEAD/LICENSE) |
+
+<!-- TODO:
+| [**cmake**](https://cmake.org) | | [GitHub Releases](https://github.com/Kitware/CMake/releases) | Linux, macOS, Windows | [BSD-3-Clause](https://github.com/Kitware/CMake/blob/HEAD/Copyright.txt) |
+-->
+
+## Security
+
+When installing the tool from GitHub Releases, this action will download the tool or its installer from GitHub Releases using HTTPS with tlsv1.2+. This is basically considered to be the same level of security as [the recommended installation of rustup](https://www.rust-lang.org/tools/install).
+
+If you want a higher level of security, consider working on [#1](https://github.com/taiki-e/install-action/issues/1).
+
+## Related Projects
+
+- [create-gh-release-action]: GitHub Action for creating GitHub Releases based on changelog.
+- [upload-rust-binary-action]: GitHub Action for building and uploading Rust binary to GitHub Releases.
+
+[create-gh-release-action]: https://github.com/taiki-e/create-gh-release-action
+[upload-rust-binary-action]: https://github.com/taiki-e/upload-rust-binary-action
+
+## License
+
+Licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or
+[MIT license](LICENSE-MIT) at your option.
+
+Each of the tools installed by this action has a different license. See the [Supported tools](#supported-tools) section for more information.
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.