update installation instructions

docs/src/installation.md

@@ -1,8 +1,35 @@
 # Installation
 
-`haddock-restraints` is a Rust command-line tool. To install it, you need to have the Rust toolchain installed on your system. You can install Rust by following the instructions on the [official website](https://www.rust-lang.org/tools/install).
+`haddock-restraints` is a Rust command-line tool. You can either download the pre-compiled binary, download from the Rust package manager or build it from source.
 
-It is also published in [Crates.io](https://crates.io/crates/haddock-restraints), so you can install it using the following command using Cargo, the Rust package manager:
+## Download
+
+Get a pre-compiled binary for your system at the link below:
+
+<div style="">
+  <style>
+    .feedback-button {
+      display: inline-block;
+      padding: 10px 20px;
+      background-color: #337ab7;
+      color: white !important;
+      text-decoration: none;
+      border-radius: 5px;
+      font-weight: bold;
+      transition: background-color 0.3s ease;
+    }
+    .feedback-button:hover {
+      background-color: #23527c;
+    }
+  </style>
+
+<a href="https://github.com/haddocking/haddock-restraints/releases/tag/v0.5.0" class="feedback-button" target="_blank">Download</a>
+
+</div>
+
+## Build from Cargo
+
+To install the tool using Cargo, you need to have the Rust toolchain installed on your system. You can install Rust by following the instructions on the [official website](https://www.rust-lang.org/tools/install).
 
 ```bash
 cargo install haddock-restraints
@@ -24,6 +51,6 @@ cd haddock-restraints
 cargo build --release
 ```
 
-***
+---
 
 Go ahead and proceed to the [USAGE](./usage.md) section to learn how to use the tool.