Added Logog + FAQ on docs

Author: arguiot

docs/css/main.css

@@ -248,7 +248,14 @@ section {
     width: 60vw;
     max-width: 800px;
 }
-
+h3 {
+	text-align: center;
+}
+.sep {
+	border-top: 1px solid #eee;
+	padding-top: 20px;
+	padding-bottom: 20px
+}
 .gist-meta {
     display: none;
 }

docs/index.html

@@ -59,6 +59,7 @@
 		</div>
 	</nav>
 	<div class="header">
+		<img src="img/TheoremJS.svg" alt="TheoremJS Logo" height="200">
 		<h1>TheoremJS</h1>
 		<p>A Math framework for computation in JavaScript</p>
 	</div>
@@ -76,7 +77,18 @@ <h2>Written in JavaScript ❤️</h2>
 				all the math is done with precision.
 			</p>
 		</section>
-		<section>
+		<section class="sep">
+			<h2 align="center">FAQ</h2>
+			<h3>Does it fix the floating point precision bug in JS?</h3>
+			<p>
+				<b>Yes.</b> We use the <a href="http://mikemcl.github.io/bignumber.js/">BigNumber</a> library to fix that.
+			</p>
+			<h3>Can I graph some cool stuff with it? A bit like using matplotlib in Python?</h3>
+			<p>
+				<b>Yes, but</b> you won't be able to do it only with <b>TheoremJS</b>. I've built a small library for this, it's called <a href="https://arguiot.github.io/Descartes">Descartes</a>.
+			</p>
+		</section>
+		<section class="sep">
 			<h2>Installation</h2>
 			<p>
 				Are you conviced? If yes, open a terminal and write down the code below.