Add selected environment options

.env.sample

@@ -18,3 +18,20 @@ SECRET_DB_PASSWORD_VERSION=v1
 #CMD_OAUTH2_USER_PROFILE_URL="https://keycloak.example.com/auth/realms/realmname/protocol/openid-connect/userinfo"
 #
 #SECRET_OAUTH_KEY_VERSION=v1
+
+# Options, see https://docs.hedgedoc.org/configuration/
+
+# CMD_ALLOW_ANONYMOUS
+# CMD_ALLOW_ANONYMOUS_EDITS
+# CMD_ALLOW_EMAIL_REGISTER
+# CMD_ALLOW_FREEURL
+# CMD_ALLOW_GRAVATAR
+# CMD_ALLOW_ORIGIN
+# CMD_COOKIE_POLICY
+# CMD_CSP_ADD_DISQUS
+# CMD_CSP_ADD_GOOGLE_ANALYTICS
+# CMD_CSP_ENABLE
+# CMD_CSP_REPORTURI
+# CMD_DEFAULT_PERMISSION
+# CMD_EMAIL
+# CMD_SESSION_LIFE