Added Gradle instructions.

README.html

@@ -446,5 +446,15 @@ Cause: &lt;pre&gt;<span class="kw">&lt;hs:cause</span><span class="ot"> default<
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+<hr />
+<h2 id="use-with-gradle">Use with <a href="https://gradle.org/">Gradle</a></h2>
+<p>Include the following in your <code>build.gradle</code> file:</p>
+<pre class="gradle"><code>repositories {
+    jcenter()
+}
+
+dependencies {
+    compile &#39;net.thauvin.erik.httpstatus:httpstatus:1.0.2&#39;
+}</code></pre>
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