create permanent gemini client object for page

src/app/browser/window/tab/item/page/client.rs

@@ -0,0 +1,14 @@
+pub struct Client {
+    pub gemini: gemini::Client,
+}
+
+impl Client {
+    // Constructors
+
+    /// Create new `Self`
+    pub fn new() -> Self {
+        Self {
+            gemini: gemini::Client::new(),
+        }
+    }
+}