Add example config

etc/nss_pam_oidc.example.toml

+debug = true
+auth_url = "https://ticdesk-dev.teckids.org/oauth/authorize/"
+token_url = "https://ticdesk-dev.teckids.org/oauth/token/"
+
+[pam]
+client_id = "Df1cpPEBsbG64oZ1Q1L8NetH1UKNBUyA5qhxg1Zh"
+client_secret = ""
+
+[nss]
+client_id = "z8Oz0tG56QRo9QEPUZTs5Eda410FMiJtYxlInxKE"
+client_secret = ""
+passwd_url = "https://ticdesk-dev.teckids.org/app/nis/api/passwd/"
+
+[nss.maps.passwd]
+name = { type = "rename", value = "username" }
+passwd = { type = "static", value = "x" }
+# uid left unchanged
+gid = { type = "rename", value = "primary_gid" }
+gecos = { type = "static", value = "Foo" }
+dir = { type = "rename", value = "home_directory" }
+shell = { type = "rename", value = "login_shell" }