feat: README.md directions (#2)

Author: o-az

.github/README.md

@@ -1 +1,10 @@
-Easily switch your macOS Apps icons
+<div align="center" style="text-align: center;">
+  <h1>Macover</h1>
+  <p>Easily switch your macOS Apps icons.</p>
+
+  <img alt="Demo Menu" align="center" src="https://raw.githubusercontent.com/o-az/macover/refs/heads/o-az/main/.github/assets/demo-menu.png" />
+</div>
+
+## Download
+
+You can download the latest version of Macover from the [Releases](https://github.com/o-az/macover/releases) page.