SDK-1500 Document passkeys better (#133)

* SDK-1500 Document passkeys better

* Add links to Passkeys documentation to main readmes

README.md

@@ -66,6 +66,8 @@ the near future! The full list of currently supported products is as follows:
 - [OAuth](sdk/src/main/java/com/stytch/sdk/consumer/oauth/README.md)
     - Register/authenticate with native Google OneTap
     - Register/authenticate with our supported third-party OAuth providers (Amazon, BitBucket, Coinbase, Discord, Facebook, Github, GitLab, Google, LinkedIn, Microsoft, Salesforce, Slack, Twitch, or Yahoo)
+- [Passkeys](passkeys)
+  - Register/authenticate with Passkeys
 - [User Management](sdk/src/main/java/com/stytch/sdk/consumer/userManagement/README.md)
     - Get or fetch the current user object (sync/cached or async options available)
     - Delete factors by id from the current user

sdk/build.gradle

@@ -98,6 +98,7 @@ tasks.named("dokkaHtmlPartial").configure {
                 "src/main/java/com/stytch/sdk/consumer/magicLinks/README.md",
                 "src/main/java/com/stytch/sdk/consumer/oauth/README.md",
                 "src/main/java/com/stytch/sdk/consumer/otp/README.md",
+                "src/main/java/com/stytch/sdk/consumer/passkeys/README.md",
                 "src/main/java/com/stytch/sdk/consumer/passwords/README.md",
                 "src/main/java/com/stytch/sdk/consumer/sessions/README.md",
                 "src/main/java/com/stytch/sdk/consumer/userManagement/README.md",

sdk/src/main/java/com/stytch/sdk/consumer/README.md

@@ -18,6 +18,8 @@ Stytch's consumer SDK makes it simple to seamlessly onboard, authenticate, and e
 - [OAuth](oauth)
     - Register/authenticate with native Google OneTap
     - Register/authenticate with our supported third-party OAuth providers (Amazon, BitBucket, Coinbase, Discord, Facebook, Github, GitLab, Google, LinkedIn, Microsoft, Salesforce, Slack, Twitch, or Yahoo)
+- [Passkeys](passkeys)
+  - Register/authenticate with Passkeys
 - [User Management](userManagement)
     - Get or fetch the current user object (sync/cached or async options available)
     - Delete factors by id from the current user

sdk/src/main/java/com/stytch/sdk/consumer/passkeys/README.md

@@ -0,0 +1,12 @@
+# Package com.stytch.sdk.consumer.passkeys
+The [Passkeys](Passkeys.kt) interface provides methods for registering and authenticating with Passkeys.
+
+To enable passkey support for your Android app, associate your app with a website that your app owns. You can declare this association by following the instructions [here](https://developer.android.com/training/sign-in/passkeys#add-support-dal)
+
+Once you've associated your app and domain, you can use the below methods to register and authenticate with the Stytch Passkeys product.
+
+Call `StytchClient.passkeys.register()` to create a new Passkey registration.
+
+Call `StytchClient.passkeys.authenticate()` to authenticate a user with an existing Passkey.
+
+Call `StytchClient.passkeys.update()` to update the name of an existing Passkey.