Profile_variants: initial markdown conversion

Profile_variants.md

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+Introduction
+============
+
+Can have more than one version of a profile.
+
+The profile variant may have different permissions/rules.
+
+Allows customizing profiles for different situations but still have
+a single name.
+
+Multiple variants can be loaded and applied at the same time.
+
+Variants are based on the attachment conditional
+
+```
+ profile firefox attach=/usr/bin/firefox {
+
+ }
+
+ profile firefox attach=/usr/lib/firefox {
+
+ }
+```
+
+If they have they same rules could do with a single attachment
+
+```
+ profile firefox attach=/usr/{bin/firefox,lib/firefox} {
+
+ }
+```
+
+Variants do not change the label for the purposes of label
+introspection or communication.
+
+However they do change the type that needs to be used for caching
+
+but sometimes installs at different locations need different
+permissions.
+
+variants can also be used to make choices based off of the user being attached to.
+
+```
+ profile firefox attach=(file=/usr/bin/firefox user=alice) {
+ }
+
+ profile firefox attach=(file/usr/bin/firefox user=bob) {
+ }
+```