Add Navbar component, emotion for css and storybook

front/src/layout/AppLayout.tsx

@@ -0,0 +1,22 @@
+import Navbar from './Navbar';
+import styled from '@emotion/styled';
+
+const StyledLayout = styled.div`
+  display: flex;
+  flex-direction: column;
+`;
+
+type OwnProps = {
+  children: JSX.Element;
+};
+
+function AppLayout({ children }: OwnProps) {
+  return (
+    <StyledLayout>
+      <Navbar />
+      <div>{children}</div>
+    </StyledLayout>
+  );
+}
+
+export default AppLayout;