docs: add relnotes template for 10.5.0

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="en">
+<head>
+  <meta http-equiv="content-type" content="text/html; charset=utf-8">
+  <title>Mesa Release Notes</title>
+  <link rel="stylesheet" type="text/css" href="../mesa.css">
+</head>
+<body>
+
+<div class="header">
+  <h1>The Mesa 3D Graphics Library</h1>
+</div>
+
+<iframe src="../contents.html"></iframe>
+<div class="content">
+
+<h1>Mesa 10.5.0 Release Notes / TBD</h1>
+
+<p>
+Mesa 10.5.0 is a new development release.
+People who are concerned with stability and reliability should stick
+with a previous release or wait for Mesa 10.5.1.
+</p>
+<p>
+Mesa 10.5.0 implements the OpenGL 3.3 API, but the version reported by
+glGetString(GL_VERSION) or glGetIntegerv(GL_MAJOR_VERSION) /
+glGetIntegerv(GL_MINOR_VERSION) depends on the particular driver being used.
+Some drivers don't support all the features required in OpenGL 3.3.  OpenGL
+3.3 is <strong>only</strong> available if requested at context creation
+because compatibility contexts are not supported.
+</p>
+
+
+<h2>MD5 checksums</h2>
+<pre>
+TBD.
+</pre>
+
+
+<h2>New features</h2>
+
+<p>
+Note: some of the new features are only available with certain drivers.
+</p>
+
+<ul>
+</ul>
+
+
+<h2>Bug fixes</h2>
+
+TBD.
+
+<h2>Changes</h2>
+
+<ul>
+</ul>
+
+</div>
+</body>
+</html>