Add Laposta Form Action documentation (#182)

Author: Copilot

src/essentials-for-yootheme-pro/v3.0-beta/_sidebars/forms.json

@@ -161,6 +161,10 @@
                         "text": "Brevo",
                         "link": "/actions/brevo"
                     },
+                    {
+                        "text": "Laposta",
+                        "link": "/actions/laposta"
+                    },
                     {
                         "text": "Mailchimp",
                         "link": "/actions/mailchimp"

src/essentials-for-yootheme-pro/v3.0-beta/addons/forms/actions/laposta.md

@@ -0,0 +1,31 @@
+# Laposta Action
+
+<div class="tm-resource-icon">
+    <!--@include: @essentials-for-yootheme-pro/v3.0-beta/assets/brands/laposta.svg-->
+</div>
+
+The **Laposta Action** subscribes, updates or removes a member from a [Laposta](https://www.laposta.nl/) list.
+
+## Subscribe Member
+
+Create or update a Laposta list member.
+
+| Setting | Description | Required | Dynamic |
+| --- | --- | :---: | :---: |
+| *Account* | The Laposta account specified with an API Key. | &#x2713; |
+| *List* | The list to which to subscribe the member. | &#x2713; |
+| *Update if exists* | Specifies if the member data should be updated if it already exists. |
+| *Email Address* | Member's email address. | &#x2713; | &#x2713; |
+| *Custom Fields* | Member's additional data specified by Laposta list custom fields. | | &#x2713; |
+<!--@include: ./_partials/common-action-settings.md-->
+
+## Delete Member
+
+Delete a Laposta list member permanently.
+
+| Setting | Description | Required | Dynamic |
+| --- | --- | :---: | :---: |
+| *Account* | The Laposta account specified with an API Key. | &#x2713; |
+| *List* | The list from which to delete the member. | &#x2713; |
+| *Email Address* | Member's email address. | &#x2713; | &#x2713; |
+<!--@include: ./_partials/common-action-settings.md-->