add goiabada (#5485)

README.md

@@ -252,6 +252,7 @@ _Libraries for implementing authentication schemes._
 - [cookiestxt](https://github.com/mengzhuo/cookiestxt) - provides a parser of cookies.txt file format.
 - [go-guardian](https://github.com/shaj13/go-guardian) - Go-Guardian is a golang library that provides a simple, clean, and idiomatic way to create powerful modern API and web authentication that supports LDAP, Basic, Bearer token, and Certificate based authentication.
 - [go-jose](https://github.com/go-jose/go-jose) - Fairly complete implementation of the JOSE working group's JSON Web Token, JSON Web Signatures, and JSON Web Encryption specs.
+- [goiabada](https://github.com/leodip/goiabada) - An open-source authentication and authorization server supporting OAuth2 and OpenID Connect.
 - [gologin](https://github.com/dghubble/gologin) - chainable handlers for login with OAuth1 and OAuth2 authentication providers.
 - [gorbac](https://github.com/mikespook/gorbac) - provides a lightweight role-based access control (RBAC) implementation in Golang.
 - [gosession](https://github.com/Kwynto/gosession) - This is quick session for net/http in GoLang. This package is perhaps the best implementation of the session mechanism, or at least it tries to become one.