add blog index and rss feed

blog.md

@@ -0,0 +1,18 @@
+---
+layout: default
+permalink: /blog
+---
+
+<div class="blog archive">
+
+    <ul class="post-list">
+    {% for post in site.posts %}
+        <li>
+            <h2 class="post-title">
+                <a class="post-link" href="{{ post.url | prepend: site.baseurl }}">{{ post.title }}</a>
+            </h2>
+        </li>
+    {% endfor %}
+    </ul>
+
+</div>

rss.xml

@@ -0,0 +1,31 @@
+---
+layout: null
+permalink: /rss
+---
+<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+  <channel>
+    <title>{{ site.title | xml_escape }}</title>
+    <description>{{ site.description | xml_escape }}</description>
+    <link>{{ site.url }}{{ site.baseurl }}/</link>
+    <atom:link href="{{ site.rss | prepend: site.baseurl | prepend: site.url }}" rel="self" type="application/rss+xml"/>
+    <pubDate>{{ site.time | date_to_rfc822 }}</pubDate>
+    <lastBuildDate>{{ site.time | date_to_rfc822 }}</lastBuildDate>
+    <generator>Jekyll v{{ jekyll.version }}</generator>
+    {% for post in site.posts limit:10 %}
+      <item>
+        <title>{{ post.title | xml_escape }}</title>
+        <description>{{ post.content | xml_escape }}</description>
+        <pubDate>{{ post.date | date_to_rfc822 }}</pubDate>
+        <link>{{ post.url | prepend: site.baseurl | prepend: site.url }}</link>
+        <guid isPermaLink="true">{{ post.url | prepend: site.baseurl | prepend: site.url }}</guid>
+        {% for tag in post.tags %}
+        <category>{{ tag | xml_escape }}</category>
+        {% endfor %}
+        {% for cat in post.categories %}
+        <category>{{ cat | xml_escape }}</category>
+        {% endfor %}
+      </item>
+    {% endfor %}
+  </channel>
+</rss>