add ninetailed destination docs

.github/styles/Vocab/Docs/accept.txt

@@ -29,6 +29,7 @@ Breyta
 Chargebee
 CloudFront
 Cocoapods
+Contentful
 Criteo
 csv
 deeplink
@@ -73,6 +74,7 @@ middleware
 Middleware
 Mixpanel
 namespace
+Ninetailed
 Okta
 Omnichannel
 onboarding

src/connections/destinations/catalog/ninetailed/index.md

@@ -0,0 +1,47 @@
+---
+title: Ninetailed Destination
+id: 60635bda625d1d13b153c8ca
+---
+
+[Ninetailed](https://ninetailed.io/?utm_source=segment&utm_medium=docs&utm_campaign=partners) is an API-first optimization platform for the modern web, which enables blazing fast personalization experiences and better data-driven experiences, for frameworks like ReactJS or GatsbyJS and headless CMS like Contentful.
+
+By integrating with [Segment](https://segment.com), you can easily and accurately track conversions and integrate 1st party data for personalization with Ninetailed.
+
+This destination is maintained by Ninetailed. For any issues with the destination, [contact the Ninetailed Support team](mailto:support@ninetailed.io).
+
+## Getting Started
+
+{% include content/connection-modes.md %}
+
+1. From the Destinations catalog page in the Segment App, click **Add Destination**.
+2. Search for "Ninetailed" in the Destinations Catalog, and select the Ninetailed destination.
+3. Choose which Source should send data to the Ninetailed destination.
+4. Copy your API Key from the Ninetailed Dashboard integrated in [your CMS](https://docs.ninetailed.io/account-and-setup/api-key?utm_source=segment&utm_medium=docs&utm_campaign=partners) (for example, Contentful).
+5. Enter the "API Key" in the "Ninetailed" destination settings in Segment.
+
+## Identify
+
+If you aren't familiar with the Segment Spec, take a look at the [Identify method documentation](/docs/connections/spec/identify/) to learn about what it does. An example call would look like:
+
+```js
+analytics.identify('userId123', {
+  email: 'john.doe@example.com'
+});
+```
+
+Segment sends Identify calls to Ninetailed as an `identify` event. 
+
+Use Identify calls to associate traits with a user with which can be used for personalization in email campaigns or website components.
+
+
+## Track
+
+If you aren't familiar with the Segment Spec, take a look at the [Track method documentation](/docs/connections/spec/track/) to learn about what it does. An example call would look like:
+
+```js
+analytics.track('Login Button Clicked')
+```
+
+Segment sends Track calls to Ninetailed as a `track` event. 
+
+With the Ninetailed Audience Builder, create experiences for visitors who have performed a special action, like `signup` or `registered_for_newsletter`.