docs: update readme (#2)

LICENSE.txt

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Frédéric Maquin <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

@@ -1,8 +1,86 @@
 # cargo-semver
 
+[![crates.io](https://img.shields.io/crates/v/cargo-semver)](https://codecov.io/gh/filipstefansson/cargo-semver)
 [![codecov](https://codecov.io/gh/filipstefansson/cargo-semver/branch/master/graph/badge.svg?token=HSAldVxPvX)](https://codecov.io/gh/filipstefansson/cargo-semver)
 
 **cargo-semver** is a cargo subcommand to help you update the version in your `Cargo.toml` file.
 
-- Update the version with `cargo semver major|minor|patch|pre`
-- Set a custom version with `cargo semver set 1.0.1`
+```console
+$ cargo semver
+1.0.0
+
+$ cargo semver patch
+1.0.1
+```
+
+> **Important**: Running this CLI writes to `Cargo.toml`. Make sure to validate the version before commit.
+
+## Installation
+
+```console
+$ cargo install cargo-semver
+```
+
+## Usage
+
+```console
+$ cargo semver # gets the current version
+$ cargo semver major|minor|patch|pre # bumps the version
+$ cargo set [VERSION] # sets a specific version
+```
+
+### Update version
+
+You can update the version in your `Cargo.toml` file using one of the subcommands:
+
+```console
+$ cargo semver major
+2.0.0
+
+$ cargo semver minor
+2.1.0
+
+$ cargo semver patch
+2.1.1
+
+$ cargo semver pre alpha
+2.1.1-alpha.1
+```
+
+If you want to bump the version and add a pre-release version in one command you can use the `pre` flag:
+
+```console
+$ cargo semver major --pre alpha
+2.0.0-alpha.1
+```
+
+### Updating the pre-release version
+
+There are multiple ways of updating the pre-release version:
+
+```console
+$ cargo semver major --pre alpha
+2.0.0-alpha.1
+
+$ cargo semver pre alpha
+2.0.0-alpha.2
+
+$ cargo semver pre
+2.0.0-alpha.3
+
+$ cargo semver pre beta
+2.0.0-beta.1
+```
+
+### Set a specific version
+
+If you want to set an exact version, use the `set` command:
+
+```console
+$ cargo semver set 2.1.3-beta.3
+2.1.3-beta.3
+```
+
+## License
+
+**cargo-semver** is provided under the MIT License. See LICENSE for details.