add content that explain how to include fano framework in application

index.html

@@ -107,6 +107,8 @@ <h3>Minimal external dependencies</h3>
                         <p>Fano Framework requires minimal external libraries to work. By default, it requires
                         only <a href="https://www.freepascal.org/">Free Pascal >= 3.0</a> compiler and its run-time libraries.
                         </p>
+                        <p>Fano Framework is composed from multiple units but to use it in
+                            your application, you only need to add `fano` unit to your uses clause.</p>
                     </section>
                     <section>
                         <span class="icon major fa-unlock"></span>