feat: pages added

src/pages/404.tsx

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+const NotFoundPage: React.FC = () => {
+  return (
+    <div>
+      <h1>404 : Not Found Page</h1>
+    </div>
+  );
+};
+
+export default NotFoundPage;

src/pages/AboutPage.tsx

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+const AboutPage: React.FC = () => {
+  return (
+    <div>
+      <h1>About Page</h1>
+    </div>
+  );
+};
+
+export default AboutPage;

src/pages/ContactPage.tsx

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+const ContactPage: React.FC = () => {
+  return (
+    <div>
+      <h1>Contact Page</h1>
+    </div>
+  );
+};
+
+export default ContactPage;

src/pages/HomePage.tsx

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+const HomePage: React.FC = () => {
+  return (
+    <div>
+      <h1>Home Page</h1>
+    </div>
+  );
+};
+
+export default HomePage;

src/pages/ProjectsPage.tsx

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+const ProjectsPage: React.FC = () => {
+  return (
+    <div>
+      <h1>Projects Page</h1>
+    </div>
+  );
+};
+
+export default ProjectsPage;