Add installation chapter and sample minimal configuration file

doc/configuration.xml

 <chapter>
   <title>Knot DNS Configuration</title>
   <para>
-    [TODO]
+    In this chapter we provide suggested configuration and explain the meaning of individual configuration options.
   </para>
+  <section>
+    <title>Sample Configurations</title>
+    <section>
+      <title>Minimal Configuration</title>
+      <para>
+	The following configuration presents a minimal configuration
+	file which can be used as a base for your Knot DNS setup.
+	<programlisting>
+#
+# knot.min.conf
+#
+# This is a sample of a minimal configuration file for Knot DNS.
+#
+# For exhaustive list of all options see samples/knot.full.conf
+# in the source directory.
+#
+
+system {
+  identity "Knot DNS";
+  storage "/var/lib/knot";
+}
+
+interfaces {
+  ipv4 { address 127.0.0.1@53; }
+}
+
+zones {
+  example.com {  
+    file "samples/example.com.zone"; 
+  }
+}
+
+log {
+  syslog { any debug, warning, error; }
+}
+	</programlisting>
+      </para>
+    </section>
+  </section>
+
 </chapter>

doc/installation.xml

 <chapter>
   <title>Knot DNS Installation</title>
-  <para>
-    Install userspace-rcu and run ./configure &amp;&amp; make &amp;&amp; make install
-  </para>
+  <section>
+    <title>Required build environment</title>
+    <para>
+      [TODO] Describe lowest needed GCC/Clang, etc.
+    </para>
+  </section>
+  <section>
+    <title>Required libraries</title>
+    <para>
+      Knot DNS requires few libraries to be compiled:
+      <itemizedlist>
+	<listitem><tt>OpenSSL</tt></listitem>
+	<listitem><tt>zlib</tt></listitem>
+	<listitem><tt>Userspace RCU</tt></listitem>
+      </itemizedlist>
+    </para>
+    <para>
+      You can probably find OpenSSL and zlib libraries already included
+      in your system or distribution.  If not, zlib resides at
+      <link xl:href="http://zlib.net/">http://zlib.net</link>, and OpenSSL can be found at
+      <link xl:href="http://www.openssl.org/">OpenSSL</link>.
+    </para>
+
+    <section>
+      <title>Userspace RCU</title>
+      <para>
+	liburcu is a LGPLv2.1 userspace RCU (read-copy-update)
+	library. This data synchronization library provides read-side
+	access which scales linearly with the number of cores. It does
+	so by allowing multiples copies of a given data structure to
+	live at the same time, and by monitoring the data structure
+	accesses to detect grace periods after which memory reclamation
+	is possible.  (<link xl:href="http://lttng.org/urcu">Userspace RCU</link>)
+      </para>
+      <para>
+	Binary packages for Debian can be found under liburcu1 for the
+	library and liburcu-dev for development files.
+      </para>
+      <para>
+	Minimum supported version of Userspace RCU library is [TODO].
+      </para>
+    </section>
+  </section>
+
+  <section>
+    <title>Installation from the sources</title>
+    <para>
+      After unpacking the sources, the compilation and installation is
+      a quite straightforward process using autotools.
+    </para>
+    <section>
+      <title>Running ./configure</title>
+      <para>
+	For all available options run:
+
+	<tt>./configure --help</tt>
+      </para>
+    </section>
+    <section>
+      <title>Compilation</title>
+      <para>
+	After running <tt>./configure</tt> you can compile Knot DNS by
+	running <tt>make</tt> command, which will produce binaries and
+	other related files.
+      </para>
+      <para>
+	Knot DNS build process is safe to paralelize using <tt>make -j
+	N</tt>, where N is number of concurrent processes.  Using this
+	option can increase speed of the compilation.
+      </para>
+    </section>
+    <section>
+      <title>Installation</title>
+      <para>
+	When you have finished building the Knot DNS, it's time to
+	install the binaries and configuration files into the
+	operation system hierarchy.  You can do so by
+	executing <tt>make install</tt> command.  When installing as a
+	non-root user you might have to gain elevated privileges by
+	switching to root user, e.g. <tt>sudo make install</tt>
+	or <tt>su -c 'make install'</tt>.
+      </para>
+    </section>
+  </section>
 </chapter>

doc/knot.xml

 <?xml version="1.0" encoding="utf-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V5.1//EN"
-                      "http://www.oasis-open.org/docbook/xml/5.1/docbookx.dtd" [
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
+          "http://www.oasis-open.org/docbook/xml/5.0/docbookx.dtd" [
 <!ENTITY introduction SYSTEM "introduction.xml">
 <!ENTITY resources SYSTEM "resources.xml">
 <!ENTITY installation SYSTEM "installation.xml">
@@ -10,7 +10,9 @@
 <!ENTITY security SYSTEM "security.xml">
 <!ENTITY troubleshooting SYSTEM "troubleshooting.xml">
 ]>
-<book xmlns="http://docbook.org/ns/docbook" version="5.0">
+<book xmlns="http://docbook.org/ns/docbook"
+      xmlns:xl="http://www.w3.org/1999/xlink"
+      version="5.0">
   <info>
     <title>Knot DNS Reference Manual</title>
     <author>