Initial commit of reference documentation

This is the initial cut of the reference documentation for Spring Cloud
Task.

Resolves spring-cloud/spring-cloud-task#49

Updates per code review

use mvnw instead of mvn in example

spring-cloud-task-docs/src/main/xslt/dependencyVersions.xsl

@@ -0,0 +1,28 @@
+<?xml version="1.0"?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+				xmlns:mvn="http://maven.apache.org/POM/4.0.0"
+				version="1.0">
+
+	<xsl:output method="text" encoding="UTF-8" indent="no"/>
+
+	<xsl:template match="/">
+		<xsl:text>|===&#xa;</xsl:text>
+		<xsl:text>| Group ID | Artifact ID | Version&#xa;</xsl:text>
+		<xsl:for-each select="//mvn:dependency">
+			<xsl:sort select="mvn:groupId"/>
+			<xsl:sort select="mvn:artifactId"/>
+			<xsl:text>&#xa;</xsl:text>
+			<xsl:text>| `</xsl:text>
+			<xsl:copy-of select="mvn:groupId"/>
+			<xsl:text>`&#xa;</xsl:text>
+			<xsl:text>| `</xsl:text>
+			<xsl:copy-of select="mvn:artifactId"/>
+			<xsl:text>`&#xa;</xsl:text>
+			<xsl:text>| </xsl:text>
+			<xsl:copy-of select="mvn:version"/>
+			<xsl:text>&#xa;</xsl:text>
+		</xsl:for-each>
+		<xsl:text>|===</xsl:text>
+	</xsl:template>
+
+</xsl:stylesheet>