add

Author: Charlotte Thomas

public/index.html

@@ -473,6 +473,8 @@ <h2>Install</h2>
 <pre style="background-color:#263238;"><span style="color:#82aaff;">cargo install mini-calc
 </span></pre>
 
+<h2>Manual</h2>
+<p>If you prefer a PDF, there is a <a href="https://github.com/coco33920/calc/blob/mistress/manual.pdf" rel="noopener noreferrer">manual</a></p>
 <h2>Contributors</h2>
 <table>
 <thead>