APL: Add examples

Author: Golmote

examples/prism-apl.html

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+<h1>APL</h1>
+<p>To use this language, use the class "language-apl".</p>
+
+<h2>Comments</h2>
+<pre><code>#!/usr/bin/env runapl
+a←1 2 3 ⍝ this is a comment</code></pre>
+
+<h2>Strings</h2>
+<pre><code>''
+'foobar'
+'foo''bar''baz'</code></pre>
+
+<h2>Numbers</h2>
+<pre><code>42
+3.14159
+¯2
+∞
+2.8e¯4
+2j3
+¯4.3e2J1.9e¯4</code></pre>
+
+<h2>Primitive functions</h2>
+<pre><code>a+b×c⍴⍳10</code></pre>
+
+<h2>Operators</h2>
+<pre><code>+/ f⍣2</code></pre>
+
+<h2>Dfns</h2>
+<pre><code>{0=⍴⍴⍺:'hello' ⋄ ∇¨⍵}</code></pre>
+
+<h2>Known failures</h2>
+<p>There are certain edge cases where Prism will fail.
+	There are always such cases in every regex-based syntax highlighter.
+	However, Prism dares to be open and honest about them.
+	If a failure is listed here, it doesn’t mean it will never be fixed. This is more of a “known bugs” list, just with a certain type of bug.
+</p>
+
+<h3>Comment-like substrings</h3>
+<pre><code>'This string is ⍝ broken'</code></pre>