Complete the README

README.md

@@ -1,4 +1,5 @@
 [![Rust](https://github.com/the-lean-crate/cargo-diet/workflows/Rust/badge.svg)](https://github.com/the-lean-crate/cargo-diet/actions?query=workflow%3ARust)
+[![Crates.io](https://img.shields.io/crates/v/cargo-diet.svg)](https://crates.io/crates/cargo-diet)
 
 `cargo diet` is a companion program of [The Lean Crate Initiative][lean-crate-initiative] to help computing 'optimal' `include` directives for your
 Cargo.toml manifest. 'optimal' here is the smallest size a crate can have while retaining everything relevant to building the code and populating `crates.io` and
@@ -22,3 +23,36 @@ interfering with you on subsequent invocations.
 * **force computing an `include` directive even though one exists already**
   * `cargo diet -r` or `cargo diet --reset-manifest`
   * can also be used with `--dry-run` such as in `cargo diet --reset-manifest --dry-run` or `cargo diet -rn`
+
+
+### Installation
+
+#### Using Cargo
+
+With a recent version of `cargo` (obtainable using [rustup][rustup]), the following should work:
+
+```bash
+cargo install cargo-diet
+```
+
+[rustup]: https://rustup.rs/
+
+#### Using GitHub releases
+
+Pre-built binaries can be found in the [releases](https://github.com/the-lean-crate/cargo-diet/releases) section of this repository.
+
+
+### Development
+
+#### Run tests
+
+```bash
+make journey-tests
+```
+
+#### Learn about other targets
+
+```
+make
+```
+