chore: added documentation to connector

packages/connectors/connector-postmark/CHANGELOG.md

@@ -0,0 +1,7 @@
+# @logto/connector-postmark
+
+## 1.0.0
+
+### Patch Changes
+
+- Initial implementation.

packages/connectors/connector-postmark/README.md

@@ -1,3 +1,61 @@
 # Postmark connector
 
-TODO: Work in progress.
+Logto connector for Postmark email service.
+
+## Get started
+
+Postmark is a mail platform for transactional and marketing email. We can use its email sending function to send a _verification code_.
+
+## Register Postmark account
+
+Create a new account at [Postmark website](https://postmark.com/). You may skip this step if you've already got an account.
+
+## Configure your connector
+
+Fill out the `serverToken` field with the Server Token you find under settings for your
+server in Postmark.
+
+Fill out the `fromEmail` field with the senders' _From Address_. 
+
+In order to enable full user flows, templates with usageType `Register`, `SignIn`, `ForgotPassword` and `Generic` are required
+
+Here is an example of Postmark connector template JSON.
+
+```jsonc
+[
+    {
+        "usageType": "Register",
+        "templateAlias": "logto-register"
+    },
+    {
+        "usageType": "SignIn",
+        "templateAlias": "logto-sign-in"
+    },
+    {
+        "usageType": "ForgotPassword",
+        "templateAlias": "logto-forgot-password"
+    },
+    {
+        "usageType": "Generic",
+        "templateAlias": "logto-generic"
+    },
+]
+```
+
+## Test Postmark email connector
+
+You can type in an email address and click on "Send" to see whether the settings can work before "Save and Done".
+
+That's it. Don't forget to [Enable connector in sign-in experience](https://docs.logto.io/docs/tutorials/get-started/passwordless-sign-in-by-adding-connectors#enable-sms-or-email-passwordless-sign-in)
+
+## Config types
+
+| Name        | Type              |
+|-------------|-------------------|
+| serverToken | string            |
+| fromEmail   | string            |
+
+| Template Properties | Type        | Enum values                                          |
+|---------------------|-------------|------------------------------------------------------|
+| usageType           | enum string | 'Register' \| 'SignIn' \| 'ForgotPassword' \| 'Generic' |
+| templateAlias       | string      | N/A                                                  |

packages/connectors/connector-postmark/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@logto/connector-postmark",
-  "version": "0.0.1",
+  "version": "1.0.0",
   "description": "Postmark connector implementation.",
   "author": "Sten Sandvik <stenrs@gmail.com>",
   "dependencies": {