create warning/verified icon to use in header/composer/member info

src/components/views/rooms/E2EIcon.js

@@ -0,0 +1,35 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import classNames from 'classnames';
+import { _t } from '../../../languageHandler';
+
+export default function(props) {
+    const isWarning = props.status === "warning";
+    const isVerified = props.status === "verified";
+    const e2eIconClasses = classNames({
+        mx_E2EIcon: true,
+        mx_E2EIcon_warning: isWarning,
+        mx_E2EIcon_verified: isVerified,
+    }, props.className);
+    let e2eTitle;
+    if (isWarning) {
+        e2eTitle = _t("Some devices in this encrypted room are not trusted");
+    } else if (isVerified) {
+        e2eTitle = _t("All devices in this encrypted room are trusted");
+    }
+    return (<div className={e2eIconClasses} title={e2eTitle} />);
+}