migrate/source/github/README.md

# github

`github://user:personal-access-token@owner/repo/path`

| URL Query  | WithInstance Config | Description |
|------------|---------------------|-------------|
| user | | The username of the user connecting |
| personal-access-token | | An access token from Github (https://github.com/settings/tokens) |
| owner | | the repo owner |
| repo | | the name of the repository |
| path | | path in repo to migrations |