Add docs for experimental flag

website/source/docs/experimental/index.html.md

@@ -0,0 +1,50 @@
+---
+layout: "docs"
+page_title: "Vagrant Experimental Feature Flag"
+sidebar_current: "experimental"
+description: |-
+  Introduction to Vagrants Experimental Feature Flag
+---
+
+# Experimental Feature Flag
+
+Some features that aren't ready for release can be enabled through this feature
+flag. There are a couple of different ways of going about enabling these features:
+
+If you wish to enale every single experimental feature, you can set the flag
+to "on" by setting it to `1` like below:
+
+```shell
+export VAGRANT_EXPERIMENTAL="1"
+```
+
+You can also enable some or many features if there are specific ones you would like,
+but don't want every single feature enabled:
+
+```shell
+# Only enables feature_one
+export VAGRANT_EXPERIMENTAL="feature_one"
+```
+
+```shell
+# Enables both feature_one and feature_two
+export VAGRANT_EXPERIMENTAL="feature_one,feature_two"
+```
+
+<div class="alert alert-warning">
+  <strong>Advanced topic!</strong> This is an advanced topic for use only if
+  you want to use new Vagrant features.. If you are just getting
+  started with Vagrant, you may safely skip this section.
+
+  It is also worth noting that Vagrant will not validate the existance of a
+  feature flag.
+</div>
+
+## Valid experimental features
+
+This is a list of all the valid experimental features that Vagrant recognizes:
+
+### `typed_triggers`
+
+Enabling this feature allows triggers to recognize and execute `:type` triggers.
+More information about how these should be used can be found on the [trigger documentation page](/docs/triggers/configuration.html#trigger-types)