add the discord server

Author: jube

index.html

@@ -13,7 +13,8 @@
       <header>
         <h1>Gamedev Framework</h1>
         <p>A framework to build 2D games in C++14</p>
-        <p class="view"><a href="https://github.com/GamedevFramework/gf">View the Project on GitHub <small>GamedevFramework/gf</small></a></p>
+        <p class="view"><a href="https://github.com/GamedevFramework/gf">View the project on GitHub <small>GamedevFramework/gf</small></a></p>
+        <p class="view"><a href="https://discord.gg/2fXM3T4">Chat on the Discord server <small>GamedevFramework</small></a></p>
         <p class="view"><a href="https://www.reddit.com/r/GamedevFramework/">Talk on the Subreddit <small>/r/GamedevFramework</small></a></p>
         <p class="view"><a href="irc://chat.freenode.net/gf-devel">Join the IRC channel on Freenode <small>#gf-devel</small></a></p>
         <ul>