feat: show ram usage percentage in label #31

Author: vladkens

src/app.rs

@@ -338,7 +338,8 @@ impl App {
     let swap_usage_gb = val.swap_usage as f64 / GB as f64;
     let swap_total_gb = val.swap_total as f64 / GB as f64;
 
-    let label_l = format!("RAM {:4.2} / {:4.1} GB", ram_usage_gb, ram_total_gb);
+    let ram_pct = zero_div(ram_usage_gb, ram_total_gb) * 100.0;
+    let label_l = format!("RAM {:4.2} / {:4.1} GB ({:.1}%)", ram_usage_gb, ram_total_gb, ram_pct);
     let label_r = format!("SWAP {:.2} / {:.1} GB", swap_usage_gb, swap_total_gb);
 
     let block = self.title_block(label_l.as_str(), label_r.as_str());