Doc update

src/views/dataview/DataViewDoc.vue

@@ -7,6 +7,9 @@
 import DataView from 'primevue/dataview';
 				</CodeHighlight>
 
+                <h3>PrimeFlex</h3>
+                <p>DataView utilizes PrimeFlex library so it needs to be installed before getting started. Refer to <router-link to="/theming">FlexGrid</router-link> documentation for details.</p>
+
 				<h3>Getting Started</h3>
 				<p>DataView requires a collection of items as its value and one or more templates depending on the layout mode e.g. list and grid. Throughout the samples, a car interface having vin, brand, year and color properties are used to define an object to be displayed by the dataview. Cars are loaded by a CarService that connects to a server to fetch the cars.</p>
 <CodeHighlight lang="js">

src/views/flexgrid/FlexGridDoc.vue

@@ -2,6 +2,18 @@
 	<div class="content-section documentation flexgrid-demo">
 		<TabView>
 			<TabPanel header="Documentation">
+                <h3>Install</h3>
+                <p>PrimeFlex is available at npm, if you have an existing application run the following command to download it to your project.</p>
+<CodeHighlight lang="js">
+npm install primeflex --save
+</CodeHighlight>
+
+                <p>Then add the primeflex.css to your application</p>
+<CodeHighlight lang="js">
+import 'primeflex/primeflex.css';
+</CodeHighlight>             
+
+
 				<h3>Getting Started</h3>
 				<p>FlexGrid is a CSS utility based on flexbox. For more information about Flex, visit <a href="https://css-tricks.com/snippets/css/a-guide-to-flexbox/">A Complete Guide to Flexbox</a>. A basic grid is defined by giving
 					a container <i>p-grid</i> class and children the <i>p-col</i> class. Children of the grid will have the same width and scale according to the width of the parent.</p>