added markdown reference page

erpnext/utilities/page/markdown_reference/markdown_reference.html

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+<div class="layout-wrapper layout-wrapper-background">
+	<div class="layout-appframe">
+		<div class="appframe-titlebar">
+			<span class="appframe-title">Markdown Reference</span>
+			<span class="close" onclick="window.history.back()">&times;</span>
+		</div>
+	</div>
+	<div class="layout-main">
+		<div style="width: 60%">
+<h3>Phrase Emphasis</h3>
+<pre><code>*italic*   **bold**
+_italic_   __bold__
+</code></pre>
+
+<h3>Links</h3>
+
+<p>Inline:</p>
+
+<pre><code>An [example](http://url.com/ "Title")
+</code></pre>
+
+<p>Reference-style labels (titles are optional):</p>
+
+<pre><code>An [example][id]. Then, anywhere
+else in the doc, define the link:
+
+   [id]: http://example.com/  "Title"
+</code></pre>
+
+<h3>Images</h3>
+
+<p>Inline (titles are optional):</p>
+
+<pre><code>![alt text](/path/img.jpg "Title")
+</code></pre>
+
+<p>Reference-style:</p>
+
+<pre><code>![alt text][id]
+
+    [id]: /url/to/img.jpg "Title"
+</code></pre>
+
+<h3>Headers</h3>
+
+<p>Setext-style:</p>
+
+<pre><code>Header 1
+========
+
+Header 2
+--------
+
+</code></pre>
+
+<p>atx-style (closing #'s are optional):</p>
+
+<pre><code># Header 1 #
+
+
+</code></pre>
+
+<h3>Lists</h3>
+
+<p>Ordered, without paragraphs:</p>
+
+<pre><code>1.  Foo
+2.  Bar
+</code></pre>
+
+<p>Unordered, with paragraphs:</p>
+
+<pre><code>*   A list item.
+
+    With multiple paragraphs.
+
+*   Bar
+</code></pre>
+
+<p>You can nest them:</p>
+
+<pre><code>*   Abacus
+    * ass
+*   Bastard
+    1.  bitch
+    2.  bupkis
+        * BELITTLER
+    3. burper
+*   Cunning
+</code></pre>
+
+<h3>Blockquotes</h3>
+
+<pre><code>&gt; Email-style angle brackets
+
+&gt; are used for blockquotes.
+
+&gt; &gt; And, they can be nested.
+
+&gt; &gt;
+&gt; * You can quote a list.
+&gt; * Etc.
+</code></pre>
+
+<h3>Code Spans</h3>
+
+<pre><code>`&lt;code&gt;` spans are delimited
+by backticks.
+
+You can include literal backticks
+like `` `this` ``.
+</code></pre>
+
+<h3>Preformatted Code Blocks</h3>
+
+<p>Indent every line of a code block by at least 4 spaces or 1 tab, and use a colon at the end of the preceding paragraph.</p>
+
+<pre><code>This is a normal paragraph:
+
+    This is a preformatted
+    code block.
+
+Preceded by a space, the colon
+disappears. :
+
+    This is a preformatted
+    code block.
+</code></pre>
+
+<h3>Horizontal Rules</h3>
+
+<p>Three or more dashes or asterisks:</p>
+
+<pre><code>---
+
+* * *
+
+- - - -
+</code></pre>
+
+<h3>Manual Line Breaks</h3>
+
+<p>End a line with two or more spaces:</p>
+
+<pre><code>Roses are red,
+Violets are blue.
+</code></pre>
+		</div>
+	</div>
+</div>