Add FAQ (#2836)

source/faq/index.markdown

@@ -0,0 +1,28 @@
+---
+layout: page
+title: "FAQ"
+description: "Home Assistant' FAQ"
+date: 2015-10-08 19:05
+sidebar: false
+comments: false
+sharing: true
+footer: true
+regenerate: true
+hide_github_edit: true
+---
+
+This is a community curated list of frequently asked questions (FAQ) about the installation, setup, and usage of Home Assistant.
+
+{% assign faq = site.faq | sort: 'title' %}
+{% assign categories = faq | map: 'ha_category' | uniq | sort %}
+
+{% for category in categories %}
+## {% linkable_title {{ category }} %}
+
+  {% for entry in faq %}
+    {% if entry.ha_category == category %}
+### {% linkable_title {{ entry.description }} %}
+{{entry.content}}
+    {% endif %}
+  {% endfor %}
+{% endfor %}