Add initial experimental support for #58

- Skeleton for the whole identity store
- Support Authentication

docs/stores/README.md

@@ -1,7 +1,8 @@
 # Identity Stores
-- [Synapse](synapse.md)
-- [LDAP-based](ldap.md)
-- [SQL Databases](sql.md)
-- [Website / Web service / Web app](rest.md)
-- [Google Firebase](firebase.md)
-- [Wordpress](wordpress.md)
+- [Synapse](synapse.md) - Turn your SynapseDB into a self-contained Identity store
+- [LDAP-based](ldap.md) - Any LDAP-based product like Active Directory, Samba, NetIQ, OpenLDAP
+- [SQL Databases](sql.md) - Most common databases like MariaDB, MySQL, PostgreSQL, SQLite
+- [Website / Web service / Web app](rest.md) - Arbitrary REST endpoints
+- [Executables](exec.md) - Run arbitrary executables with configurable stdin, arguments, environment and stdout
+- [Wordpress](wordpress.md) - Connect your Wordpress-powered website DB
+- [Google Firebase](firebase.md) - Use your Firebase users (with experimental SSO support!)