Add macro tag

examples/macro/tmpls/about.html

@@ -0,0 +1,16 @@
+#macro("content"):
+    <section class="hero is-fullheight-with-navbar">
+        <div class="hero-head">
+            <div class="container">
+                <p class="title has-text-centered mt-2">About Salix</p>
+                <p>
+                    Salix (pronounced <i>say-lix</i>) is a Go templating engine inspired by <a href="https://github.com/vapor/leaf">Leaf</a>.
+                    <br><br>
+                    Salix's syntax is similar to Leaf and (in my opinion at least), it's much more fun to write than the Go template syntax. If you like this project, please star its repo. I hope you enjoy! :)
+                </p>
+            </div>
+        </div>
+    </section>
+#!macro
+
+#include("base.html")