result.csv

"CSV_Reader","Parser","RST_BatchDeletePlayWeeks","RST_BatchProcess_RawCSV","RST_Batch_GetMagicMarketCapacity","ApexClass"
"RST_ForecastUpload_Trigger","RST_PlayWeek_Trigger","RST_Version_Trigger","ApexTrigger"

source.xml

<?xml version="1.0" encoding="UTF-8"?>
<Package >
    <types>
        <members>CSV_Reader</members>
        <members>Parser</members>
        <members>RST_BatchDeletePlayWeeks</members>
        <members>RST_BatchProcess_RawCSV</members>
        <members>RST_Batch_GetMagicMarketCapacity</members>
        <name>ApexClass</name>
    </types>
    <types>
        <members>RST_ForecastUpload_Trigger</members>
        <members>RST_PlayWeek_Trigger</members>
        <members>RST_Version_Trigger</members>
        <name>ApexTrigger</name>
    </types>
    <version>43.0</version>
</Package>

transform.xsl

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text" encoding="utf-8" />

  <xsl:param name="delim" select="','" />
  <xsl:param name="quote" select="'&quot;'" />
  <xsl:param name="break" select="'&#xA;'" />

  <xsl:template match="/">
    <xsl:apply-templates select="Package/types" />
  </xsl:template>

  <xsl:template match="types">
    <xsl:apply-templates />
    <xsl:if test="following-sibling::*">
      <xsl:value-of select="$break" />
    </xsl:if>
  </xsl:template>

  <xsl:template match="*">
    <!-- remove normalize-space() if you want keep white-space at it is --> 
    <xsl:value-of select="concat($quote, normalize-space(), $quote)" />
    <xsl:if test="following-sibling::*">
      <xsl:value-of select="$delim" />
    </xsl:if>
  </xsl:template>

  <xsl:template match="text()" />
</xsl:stylesheet>