feat(ui): add welcome message

src/components/ImagePortalWelcome.jsx

@@ -0,0 +1,28 @@
+import { Container, Row, Col, Alert } from 'react-bootstrap';
+
+function ImagePortalWelcome() {
+  return (
+    <Container>
+      <Row className="d-flex align-items-center justify-content-center vh-100">
+        <Col xs={12} md={6}>
+          <Alert variant="success">
+            <Alert.Heading>Hey, nice to see you!</Alert.Heading>
+            <p>
+              Explore over 4.3 million+ high-quality stock images, videos, and
+              music shared by our talented community. This site is powered by
+              the Pixabay API, providing you with a vast collection of visuals
+              for your creative projects.
+            </p>
+            <hr />
+            <p className="mb-0">
+              Simply enter your search query, and voilà! Discover a world of
+              captivating visuals at your fingertips.
+            </p>
+          </Alert>
+        </Col>
+      </Row>
+    </Container>
+  );
+}
+
+export default ImagePortalWelcome;