Фронтенд для сервиса (#5)

Co-authored-by: gorbenko.pavel <gorbenko.pavel@tansu.kz>
Reviewed-on: http://git.tnsu.kz/gorbenko.pavel/tnsu-approval-route/pulls/5

frontend/src/webparts/approvalAdmin/components/app/AdminApp.module.scss

@@ -0,0 +1,26 @@
+@import '../../../../styles/design-tokens';
+
+.shell {
+  background: linear-gradient(180deg, #F6F8FA 0%, #EEF2F6 100%);
+  border-radius: $r-lg;
+  border: 1px solid $gray-200;
+  overflow: hidden;
+  box-shadow: $sh-1;
+  color: $gray-900;
+  font-family: $font-sans;
+  font-size: $fs-body;
+  line-height: 1.55;
+}
+
+.content {
+  padding: 28px 30px 36px;
+  max-width: 1080px;
+  margin: 0 auto;
+}
+
+.centerState {
+  padding: 60px 30px;
+  text-align: center;
+  color: $gray-400;
+  font-size: 13.5px;
+}