feat: add cargo-rpm

- add details for `cargo-rpm`.
- correct details on CONTRIBUTING for linking to crates.io.

CONTRIBUTING.md

@@ -12,7 +12,7 @@ If you want to add an entry to the `README.md` please consider this:
 
 - is the entry valuable to people trying to get things done in Rust?
     * In order to make this objective, the entry needs to either have at least 50 stars on Github, 2000 downloads on crates.io, or an equivalent level of other popularity metrics (which should be specified in the PR). The maintainers of this repo are not responsible for making your project popular, only for making more people aware of those projects. We don't want to have to pick and choose favourites, and so are using metrics like this to make our lives easier as maintainers.
-- if you want to add something, please use the template `[ACCOUNT/REPO](https://github.com/ACCOUNT/REPO) [![CRATE](https://crates.io/crates/CRATE)] — DESCRIPTION`
+- if you want to add something, please use the template `[ACCOUNT/REPO](https://github.com/ACCOUNT/REPO) [[CRATE](https://crates.io/crates/CRATE)] — DESCRIPTION`
     * if you've not published your crate to `crates.io` remove the `[[CRATE](...)]` part.
     * if you have a CI build, please add the build badge. Put the image after the description, separated by a space. Please make sure to add the branch information to the image:
         * example for Travis: `[![build badge](https://api.travis-ci.com/XXX/CRATE.svg?branch=master)](https://app.travis-ci.org/github/XXX/CRATE)`

README.md

@@ -500,6 +500,7 @@ See also [A comparison of operating systems written in Rust](https://github.com/
   * [cargo-multi](https://crates.io/crates/cargo-multi) — runs specified cargo command on multiple crates [![build badge](https://api.travis-ci.org/imp/cargo-multi.svg?branch=master)](https://travis-ci.org/imp/cargo-multi)
   * [cargo-outdated](https://crates.io/crates/cargo-outdated) — displays when newer versions of Rust dependencies are available, or out of date [![build badge](https://api.travis-ci.org/kbknapp/cargo-outdated.svg?branch=master)](https://travis-ci.org/kbknapp/cargo-outdated)
   * [cargo-release](https://crates.io/crates/cargo-release) — tool for releasing git-managed cargo project, build, tag, publish, doc and push [![Rust](https://github.com/crate-ci/cargo-release/actions/workflows/ci.yml/badge.svg)](https://github.com/crate-ci/cargo-release/actions/workflows/rust.yml)
+  * [cargo-rpm](https://github.com/iqlusioninc/cargo-rpm) [[cargo-rpm](https://crates.io/crates/cargo-rpm)] — cargo subcommand for building .rpm releases of Rust projects.
   * [cargo-script](https://crates.io/crates/cargo-script) — lets people quickly and easily run Rust "scripts" which can make use of Cargo's package ecosystem [![build badge](https://api.travis-ci.org/DanielKeep/cargo-script.svg?branch=master)](https://travis-ci.org/DanielKeep/cargo-script)
   * [cargo-tree](https://github.com/sfackler/cargo-tree) – Cargo subcommand that visualizes a crate's dependency graph in a tree-like format [![CircleCI](https://circleci.com/gh/sfackler/cargo-tree.svg?style=shield)](https://app.circleci.com/pipelines/github/sfackler/cargo-tree)
   * [cargo-update](https://crates.io/crates/cargo-update) — cargo subcommand for checking and applying updates to installed executables [![build badge](https://api.travis-ci.org/nabijaczleweli/cargo-update.svg?branch=master)](https://travis-ci.org/nabijaczleweli/cargo-update)