Create readme.md

Author: acoumb

src/Umbraco.Forms.Integrations.Automation.Zapier/readme.md

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+# Umbraco.Forms.Integrations.Automation.Zapier
+
+This integration provides a custom workflow, allowing form entries to be mapped to the fields of a Zap tool trigger from Zapier.
+
+A Zap is an automated workflow that connects various apps and services together. Each Zap consists of a trigger and one or more actions.
+
+## Prerequisites
+
+Requires minimum versions of Umbraco:
+
+- CMS: 8.1.0
+- Forms: 8.9.1
+
+## How To Use
+
+### Authentication
+
+For this integration, the authentication is managed on Zapier's side. 
+
+When creating a Zap trigger, you will be prompted to enter a username, password and the URL for your Umbraco website.
+
+Then the Umbraco application existing in the Zapier marketplace will validate the credentials entered and return a message in case the validation fails.
+
+If you want to extend the security layer, you can also specify a user group that the user trying to connect needs to be a part of, by adding the following 
+setting in `Web.config`:
+
+```
+<appSettings>
+...
+  <add key="Umbraco.Cms.Integrations.Automation.Zapier.UserGroup" value="[your User Group]" />
+...
+</appSettings>
+```
+
+### Working With the Zapier Forms Integration
+Add the _Trigger Zap_ workflow to a form and configure which fields will be sent to the Zap.
+
+You can add mappings for each of the form's fields (if no mapping is created, all fields will be included by default), and also pick one of the
+standard fields: Form ID, Form Name, Page URL, Submission date/time.