add missing env var samples

.env.example

@@ -1,3 +1,13 @@
+# Set this value to 'agree' to accept our license: 
+# LICENSE: https://github.com/calendso/calendso/blob/main/LICENSE
+#
+# Summary of terms:
+# - The codebase has to stay open source, whether it was modified or not
+# - You can not repackage or sell the codebase
+# - Acquire a commercial license to remove these terms by emailing: license@cal.com
+NEXT_PUBLIC_LICENSE_CONSENT=''
+LICENSE=''
+
 POSTGRES_USER=unicorn_user
 POSTGRES_PASSWORD=magical_password
 POSTGRES_DB=calendso
@@ -30,3 +40,6 @@ EMAIL_SERVER_PASSWORD='email_password'
 
 # Encryption key that will be used to encrypt CalDAV credentials, choose a random string, for example with `dd if=/dev/urandom bs=1K count=1 | md5sum`
 CALENDSO_ENCRYPTION_KEY=''
+
+JWT_SECRET=secret
+NODE_ENV=production