[feat] add server window

src/gui/windows/server_window.cpp

@@ -0,0 +1,23 @@
+#include "render.h"
+
+namespace crossdesk {
+int Render::ServerWindow() {
+  ImGui::SetNextWindowSize(
+      ImVec2(main_window_width_ - 2 * main_child_window_x_padding_,
+             main_window_height_ - status_bar_height_ -
+                 main_window_text_y_padding_ - main_child_window_y_padding_),
+      ImGuiCond_Always);
+  ImGui::SetNextWindowPos(
+      ImVec2(main_child_window_x_padding_, main_window_text_y_padding_),
+      ImGuiCond_Always);
+  ImGui::Begin("##server_window", nullptr,
+               ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize |
+                   ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoCollapse |
+                   ImGuiWindowFlags_NoScrollbar |
+                   ImGuiWindowFlags_NoScrollWithMouse);
+  // server window content goes here
+  ImGui::Text("Server Window Content");
+  ImGui::End();
+  return 0;
+}
+}  // namespace crossdesk