Added 'facebook' template

application/src/main/data/json/system/oauth2_config_templates/facebook_config.json

@@ -0,0 +1,19 @@
+{
+  "providerId": "Facebook",
+  "accessTokenUri": "https://graph.facebook.com/v2.8/oauth/access_token",
+  "authorizationUri": "https://www.facebook.com/v2.8/dialog/oauth",
+  "scope": ["email","public_profile"],
+  "jwkSetUri": null,
+  "userInfoUri": "https://graph.facebook.com/me?fields=id,name,first_name,last_name,email",
+  "clientAuthenticationMethod": "basic",
+  "userNameAttributeName": "email",
+  "basic": {
+    "emailAttributeKey": "email",
+    "firstNameAttributeKey": "first_name",
+    "lastNameAttributeKey": "last_name",
+    "tenantNameStrategy": "DOMAIN"
+  },
+  "comment": null,
+  "icon": "mdi:facebook",
+  "helpLink": "https://developers.facebook.com/docs/facebook-login/web#logindialog"
+}