doc: Add adopters placeholder

README.md

@@ -38,6 +38,7 @@ able to securely manage JSON Web Keys.
 **Table of Contents**
 
 - [What is ORY Hydra?](#what-is-ory-hydra)
+  - [Who uses it?](#who-uses-it)
   - [OAuth2 and OpenID Connect: Open Standards!](#oauth2-and-openid-connect-open-standards)
   - [OpenID Connect Certified](#openid-connect-certified)
 - [Quickstart](#quickstart)
@@ -80,6 +81,12 @@ ORY Hydra implements the flows described in OAuth2 and OpenID Connect 1.0 withou
 or some template engine or a predefined front-end. Instead it relies on HTTP redirection and cryptographic methods
 to verify user consent allowing you to use ORY Hydra with any authentication endpoint, be it [authboss](https://github.com/go-authboss/authboss), [User Frosting](https://www.userfrosting.com/) or your proprietary Java authentication.
 
+### Who uses it?
+
+<!-- BEGIN ADOPTERS -->
+
+<!-- END ADOPTERS -->
+
 ### OAuth2 and OpenID Connect: Open Standards!
 
 ORY Hydra implements Open Standards set by the IETF: