Add docs for new 1Flow Analytics destination (#3830)

* Add docs for new 1Flow Analytics destination

* Update src/connections/destinations/catalog/1flow-analytics/index.md

Co-authored-by: markzegarelli <[email protected]>

Author: tcgilbert

src/connections/destinations/catalog/1flow-analytics/index.md

@@ -0,0 +1,70 @@
+---
+title: 1Flow Analytics Destination
+id: 62bf80378e3d0241ab190594
+---
+
+[1Flow](https://1flow.app/?utm_source=segmentio&utm_medium=docs&utm_campaign=partners) is a leading in-app user survey and messaging platform for Mobile app and SaaS businesses.
+
+Using 1Flow, you can reach users _in-the-moment_ while they are interacting with your website or application, to collect highly contextual user insights that help you improve your product offering and customer experience.
+
+This destination is maintained by 1Flow. For any issues with the destination, [contact the 1Flow Support team](mailto:[email protected]).
+
+## Getting Started
+
+
+1. From the Destinations catalog page in the Segment App, click **Add Destination**.
+2. Search for **1Flow** in the Destinations Catalog, and select the **1Flow** destination.
+3. Choose which Source should send data to the 1Flow destination.
+4. Go to the [1Flow dashboard](https://dashboard.1flow.app/){:target="\_blank"} and find the **API Key** in Project Settings.
+5. Enter the **API Key** in the 1Flow destination settings in Segment.
+
+## Supported methods
+
+1Flow supports the following methods, as specified in the [Segment Spec](/docs/connections/spec).
+
+### Identify
+
+Send [Identify](/docs/connections/spec/identify) calls to create new user profile or update existing users with new trait values. For example:
+
+```js
+analytics.identify("userId123", {
+  email: "[email protected]",
+});
+```
+
+Segment sends Identify calls to 1Flow as an `identify` event.
+
+### Track
+
+Send [Track](/docs/connections/spec/track) calls to record user behavior in your app. For example:
+
+```js
+analytics.track("Login Button Clicked");
+```
+
+Segment sends Track calls to 1Flow as a `track` event.
+
+### Page
+
+Send [Page](/docs/connections/spec/page) calls to record which website pages users have visited. For example:
+
+```js
+analytics.page("Pricing", {
+  title: "Segment Pricing",
+  url: "https://segment.com/pricing",
+  path: "/pricing",
+  referrer: "https://segment.com/warehouses",
+});
+```
+
+Segment sends Page calls to 1Flow as a `page_[name]` event. (or `page_view` if a page name isn’t provided).
+
+### Screen
+
+Send [Screen](/docs/connections/spec/screen) calls to record which mobile app screens users have viewed. For example:
+
+```obj-c
+[[SEGAnalytics sharedAnalytics] screen:@"Home"];
+```
+
+Segment sends Screen calls to 1Flow as a `screen_[name]` event (or `screen_view` if a screen name isn't provided).