Update doc to install dylint-link tool. (#60)

* adding doc to install dylint tool.

* rename Dylint to dylint-link it based on the cargo package

* Apply suggestions from code review

Co-authored-by: Michael Müller <mich@elmueller.net>

docs/getting-started/setup.md

@@ -16,6 +16,12 @@ The first tool we will be installing is [`cargo-contract`](https://github.com/pa
 
 As a pre-requisite for the tool you need to install the [binaryen](https://github.com/WebAssembly/binaryen) package, which is used to optimize the WebAssembly bytecode of the contract.
 
+Two other dependencies are needed to lint the ink! contract. This is done to warn users about using e.g. API's in a way that could lead to security issues.
+
+```bash
+cargo install cargo-dylint dylint-link
+```
+
 Many package managers have it available nowadays ‒ e.g. there is a package for [Debian/Ubuntu](https://tracker.debian.org/pkg/binaryen),
 [Homebrew](https://formulae.brew.sh/formula/binaryen) and [Arch Linux](https://archlinux.org/packages/community/x86_64/binaryen/).