Docs: Add 6.0 versions page

Change-Id: I3fa5af5c56a95e19e2f7d9babc6d26e157f2a7c3
diff --git a/src/compatibility/6.0/versions.jd b/src/compatibility/6.0/versions.jd
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+++ b/src/compatibility/6.0/versions.jd
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+page.title=Permitted Version Strings for Android 6.0
+<p>As described in Section 3.2.2 of the <a
+href="/compatibility/android-6.0-cdd.pdf">Android 6.0 Compatibility Definition</a>,
+only certain strings are allowable for the system property
+<code>android.os.Build.VERSION.RELEASE</code>. The reason for this is that
+applications and web sites may rely on predictable values for this string, and
+so that end users can easily and reliably identify the version of Android
+running on their devices.</p>
+<p>Because subsequent releases of the Android software may revise this string,
+but not change any API behavior, such releases may not be accompanied by a new
+Compatibility Definition Document. This page lists the versions that are
+allowable by an Android 6.0-based system. The only permitted values for
+<code>android.os.Build.VERSION.RELEASE</code> for Android 6.0 are:</p>