Add warning to private space creation flow

src/components/structures/SpaceRoomView.tsx

@@ -587,6 +587,10 @@ const SpaceSetupPrivateScope = ({ space, justCreatedOpts, onFinished }) => {
             <h3>{ _t("Me and my teammates") }</h3>
             <div>{ _t("A private space for you and your teammates") }</div>
         </AccessibleButton>
+        <div className="mx_SpaceRoomView_betaWarning">
+            <h3>{ _t("Teammates might not be able to view or join any private rooms you make.") }</h3>
+            <p>{ _t("We're working on this as part of the beta, but just want to let you know.") }</p>
+        </div>
         <SpaceFeedbackPrompt />
     </div>;
 };