Convert some components to Typescript

Gitlab: #30

Change-Id: I9fbd857ef93866609682fb46be8b04904ee4e66f
diff --git a/client/src/components/ConversationAvatar.tsx b/client/src/components/ConversationAvatar.tsx
new file mode 100644
index 0000000..decdb65
--- /dev/null
+++ b/client/src/components/ConversationAvatar.tsx
@@ -0,0 +1,8 @@
+import { Avatar, AvatarProps } from '@mui/material';
+
+type ConversationAvatarProps = AvatarProps & {
+  displayName?: string;
+};
+export default function ConversationAvatar({ displayName, ...props }: ConversationAvatarProps) {
+  return <Avatar {...props} alt={displayName} src="/broken" />;
+}