Update README.md

README.md

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 <p>Welcome to the repository containing various programming books in PDF format. Feel free to explore and enhance your programming skills!!</p>
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+<p><em>⚠️If you encounter the error "Unable to render code block" when trying to view the PDF, it may be due to a GitHub issue with rendering large files. To resolve this, you can just download that PDF and open it using your preferred PDF viewer:</em></p>
   <h1>Books Included:</h1>
   <ul>
       <li><a href="CodingBook.pdf">Competitive Programmer Book</a></li>
       <li><a href="Cracking-the-Coding-Interview-6th-Edition-189-Programming-Questions-and-Solutions.pdf">Cracking the Coding Interview. (6th Edition)</a></li>
       <li><a href="Data Structures and Algorithms in Python [EnglishOnlineClub.com].pdf">Data Structures and Algorithms in Python</a></li>
       <li><a href=Guide to Competitive Programming_ Learning and Improving Algorithms Through Contests ( PDFDrive.com ).pdf">Guide to Competitive Programming</a></li>
       <li><a href="python-crash-course.pdf">Python Crash Course</a></li>
+      <li><a href ="Head_First_Java_A_Brain-Friendly_Guide.pdf">Head First Java - by Bert Bates and Kathy Sierra</a></li>
   </ul>
 
   <h2>How to Use:</h2>