Merge pull request #622 from kinde-oss/feat/add-username-validation-guide

feat: add username validation workflow references

Author: DanielRivers

src/content/docs/authenticate/authentication-methods/username-authentication.mdx

@@ -94,6 +94,8 @@ Once an email is verified, we add this email identity for the user. If the auth
 - Can include letters, numbers, -dashes, \_underscores (no special characters)
 - Case is ignored. Jane and jane are treated the same.
 
+You can bring your own validation rule using Workflows ([example](https://github.com/kinde-starter-kits/workflow-examples/blob/main/usernameValidation/customUsernameValidation.ts))
+
 ## One password for multiple identities
 
 Users can only have a single password in Kinde.

src/content/docs/workflows/getting-started/workflow-examples.mdx

@@ -58,3 +58,4 @@ These can be used as a starting point for your own workflows. You can find them
 - [Add custom claims to access token](https://github.com/kinde-starter-kits/workflow-examples/blob/main/userTokens/customClaimsAccessTokenWorkflow.ts) - Call an external API to get data to add as custom claims to the user access token.
 - [Map M2M applications to organizations](https://github.com/kinde-starter-kits/workflow-examples/blob/main/m2mToken/mapOrgToM2MApplicationWorkflow.ts) - Shows how to map M2M applications to organizations. Useful if using Kinde for B2B API key management
 - [Impossible travel - Trustpath integration](https://github.com/kinde-starter-kits/workflow-examples/blob/main/postUserAuthentication/impossibleTravelWorkflow.ts) - Evaluate user login risk using TrustPath's API by checking for "impossible travel" patterns based on IP and recent login activity. If high risk is detected, access is blocked proactively.
+- [Custom Username Validation](https://github.com/kinde-starter-kits/workflow-examples/blob/main/usernameValidation/customUsernameValidation.ts) - Bring your own username validation rules