Create a file:
curl -X PUT -H "Authorization: Bearer PERSONAL_ACCESS_TOKEN" -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/aforemny/spark/contents/notes/1234.md -d '{"message":"Add note 1234","content":"LS0tCmRhdGU6ICIyMDIwLTA4LTE2IgotLS0KCiMgWmV0dGVsIGNyZWF0ZWQgb24gIjIwMjAtMDgtMTYiCgo="}'