add reference to mod_sts

Signed-off-by: Hans Zandbelt <[email protected]>
OpenIDC · Apr 22, 2019 · 10cd7fb · 10cd7fb
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 # ngx_sts_module
 
 A security token exchange module for the NGINX web server which allows for exchanging arbitrary security tokens by calling into a remote Security Token Service (STS).
+For an overview and rationale see the Apache version of this module at https://github.com/zmartzone/mod_sts/blob/master/README.md.
 
 ## Quickstart