docs: document jwks uri endpoint (#3537)

* docs: add overview section

* docs: add link to specification

docs/admin/auth-server/endpoints/jwks-uri.md

@@ -0,0 +1,45 @@
+---
+tags:
+- administration
+- auth-server
+- jwks
+- json-web-key-set
+- endpoint
+---
+
+# Overview
+
+Janssen Server supports `/jwks` metadata endpoint and publishes its JSON Web Key Set (JWKS) at this endpoint. This 
+endpoint publishes signing keys as well as encryption keys used by Janssen Server. RP can use these keys to validate
+signatures from Janssen Server, and also to perform encryption and decryption.  Like other metadata endpoints, this is 
+not a secure endpoint. Further details on this endpoint and JWKs can be found in [OpenID Connect Discovery](https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata) 
+specification.
+
+URL to access jwks endpoint on Janssen Server is listed in the response of Janssen Server's well-known
+[configuration endpoint](./configuration.md) given below.
+
+```text
+https://janssen.server.host/jans-auth/.well-known/openid-configuration
+```
+
+`jwks_uri` claim in the response specifies the URL for jwks endpoint. By default, the jwks endpoint looks like below:
+
+```
+https://janssen.server.host/jans-auth/restv1/jwks
+```
+
+This endpoint is always enabled and can not be disabled using feature flags.
+
+## Configuration Properties
+
+End session endpoint can be further configured using Janssen Server configuration properties listed below. When using
+[Janssen Text-based UI(TUI)](../../config-guide/tui.md) to configure the properties,
+navigate via `Auth Server`->`Properties`.
+
+- [jwksUri](../../reference/json/properties/janssenauthserver-properties.md#jwksuri)
+- [jwksAlgorithmsSupported](../../reference/json/properties/janssenauthserver-properties.md#jwksalgorithmssupported)
+- [mtlsJwksUri](../../reference/json/properties/janssenauthserver-properties.md#mtlsjwksuri)
+
+## Want to contribute?
+
+If you have content you'd like to contribute to this page in the meantime, you can get started with our [Contribution guide](https://docs.jans.io/head/CONTRIBUTING/).