Added Readme.md file for PDF viewer component

Author: anirudh7065

Client-Side Components/UI Pages/PDF viewer page in tsx/Readme.md

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+# 📄 PDF Viewer Component
+
+A lightweight client-side **React PDF viewer** built with **pdf.js**, designed to render and display uploaded PDF files seamlessly inside your web app.
+
+---
+
+## 🚀 Features
+
+* ⚡ **Client-side rendering** — No server dependency
+* 📚 **Multi-page support** — Renders every page dynamically
+* 🧠 **Efficient memory use** — Prevents redundant re-rendering
+* 🧩 **Easy integration** — Drop into any React or Next.js app
+* 🎨 **Customizable container** — Style with Tailwind or CSS
+
+---
+
+## 🧱 Tech Stack
+
+* **React / Next.js** (client component)
+* **pdfjs-dist** (`pdf.js` library for parsing and rendering PDFs)
+* **TypeScript**
+
+---
+
+## 📦 Installation
+
+```bash
+# Using npm
+npm install pdfjs-dist
+
+# OR using yarn
+yarn add pdfjs-dist
+```
+
+---
+
+## 🧩 Usage
+
+### 1. Add the worker file
+
+You need the PDF.js worker file (`pdf.worker.min.mjs`) to be available in your public folder.
+
+**Structure:**
+
+```
+/public/pdfjs/pdf.worker.min.mjs
+```
+
+You can get it from:
+
+```
+node_modules/pdfjs-dist/build/pdf.worker.min.mjs
+```
+
+---
+
+### 2. Import and use the component
+
+```tsx
+"use client";
+import PdfViewer from "@/components/PdfViewer";
+import { useState } from "react";
+
+export default function Page() {
+  const [file, setFile] = useState<File | null>(null);
+
+  return (
+    <div className="p-4 space-y-4">
+      <input
+        type="file"
+        accept="application/pdf"
+        onChange={(e) => {
+          const selectedFile = e.target.files?.[0];
+          if (selectedFile) setFile(selectedFile);
+        }}
+      />
+
+      {file && <PdfViewer file={file} />}
+    </div>
+  );
+}
+```
+
+---
+
+## 🧠 Component Details
+
+### **File:** `PdfViewer.tsx`
+
+```tsx
+"use client";
+import { getDocument, GlobalWorkerOptions } from "pdfjs-dist/legacy/build/pdf.mjs";
+import { useEffect, useRef } from "react";
+
+GlobalWorkerOptions.workerSrc = "/pdfjs/pdf.worker.min.mjs";
+
+export default function PdfViewer({ file }: { file: File }) {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const hasRendered = useRef(false);
+
+  useEffect(() => {
+    if (!file || file.size === 0) return;
+    if (hasRendered.current) return;
+
+    hasRendered.current = true;
+    const container = containerRef.current;
+    if (!container) return;
+
+    const renderPDF = async () => {
+      container.innerHTML = "";
+
+      const arrayBuffer = await file.arrayBuffer();
+      const pdf = await getDocument({ data: arrayBuffer }).promise;
+
+      for (let i = 1; i <= pdf.numPages; i++) {
+        const page = await pdf.getPage(i);
+        const viewport = page.getViewport({ scale: 1.2 });
+
+        const canvas = document.createElement("canvas");
+        const context = canvas.getContext("2d")!;
+        canvas.height = viewport.height;
+        canvas.width = viewport.width;
+
+        await page.render({ canvasContext: context, viewport }).promise;
+
+        canvas.id = `page_${i}`;
+        container.appendChild(canvas);
+      }
+    };
+
+    renderPDF();
+
+    return () => {
+      if (container) container.innerHTML = "";
+    };
+  }, [file]);
+
+  return (
+    <div
+      ref={containerRef}
+      className="pdf-container overflow-auto h-full shadow-xl"
+    />
+  );
+}
+```
+
+---
+
+## 🎨 Styling Example (Optional)
+
+```css
+.pdf-container {
+  background-color: #f9f9f9;
+  padding: 1rem;
+  border-radius: 12px;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+canvas {
+  border: 1px solid #ddd;
+  border-radius: 8px;
+}
+```
+
+---
+
+## ⚠️ Notes
+
+* Make sure the **PDF.js worker file path** matches:
+
+  ```ts
+  GlobalWorkerOptions.workerSrc = "/pdfjs/pdf.worker.min.mjs";
+  ```
+* This component renders each page on a separate `<canvas>`.
+* For large PDFs, consider lazy loading or pagination to improve performance.
+
+---
+
+## 🧑‍💻 License
+
+This component is released under the **MIT License** — free to use and modify in your projects.