Add information, examples, and all tools sections

src/pages/string/join/Info.tsx

@@ -0,0 +1,19 @@
+import { Box, Stack, Typography } from '@mui/material';
+
+interface ExampleProps {
+  title: string;
+  description: string;
+}
+
+export default function Example({ title, description }: ExampleProps) {
+  return (
+    <Stack direction={'row'} alignItems={'center'} spacing={2} mt={4}>
+      <Box>
+        <Typography mb={2} fontSize={30} color={'primary'}>
+          {title}
+        </Typography>
+        <Typography fontSize={20}>{description}</Typography>
+      </Box>
+    </Stack>
+  );
+}