feat: add swap info

src/main.zig

@@ -47,6 +47,17 @@ pub fn main() !void {
     try stdout.print("ram: {d:.2} / {d:.2} GB ({}%)\n", .{ ram_info.ram_usage, ram_info.ram_size, ram_info.ram_usage_percentage });
     try bw.flush();
 
+    const swap_result = try os_module.getSwapInfo();
+    switch (swap_result) {
+        .swap_info => |s| {
+            try stdout.print("Swap: {d:.2} / {d:.2} GB ({}%)\n", .{ s.swap_usage, s.swap_size, s.swap_usage_percentage });
+        },
+        .swap_disabled => {
+            try stdout.print("Swap: Disabled\n", .{});
+        },
+    }
+    try bw.flush();
+
     const diskInfo = try os_module.getDiskSize("/");
     try stdout.print("disk ({s}): {d:.2} / {d:.2} GB ({}%)\n", .{ diskInfo.disk_path, diskInfo.disk_usage, diskInfo.disk_size, diskInfo.disk_usage_percentage });
     try bw.flush();