docs(example): implement OpenID Provider (#165)

* chore(example): implement OpenID Provider

* jwt profile and fixes

* some comments

* remove old op example

* fix code flow example

* add service user and update readme

* fix password for example use

* ignore example and mock folders for code coverage

* Update example/server/internal/storage.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* Update client.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

.codecov/codecov.yml

@@ -19,4 +19,7 @@ parsers:
 comment:
     layout: "header, diff"
     behavior: default
-    require_changes: no
+    require_changes: no
+ignore:
+  - "example"
+  - "**/mock"