added an antigravity plugin and custom keybind for integrated support

lua/plugins/antigravity.lua

@@ -0,0 +1,13 @@
+return {
+    "NakLast/antigravity-cli.nvim",
+    config = function()
+        require("antigravity").setup({
+            -- You can override the default command here if needed
+            cmd = "agy",
+            width_ratio = 0.4,
+            height_ratio = 0.8,
+            border = "rounded",
+            style = "vsplit",
+        })
+    end
+}