Master branch does not build

[sahina]

Cloned master branch but does not build with this error:

error: failed to load manifest for workspace member `/Users/asahin/Code/sandbox/async-graphql-examples/models/starwars`

Caused by:
  failed to load manifest for dependency `async-graphql`

Caused by:
  failed to read `/Users/asahin/Code/sandbox/Cargo.toml`

Caused by:
  No such file or directory (os error 2)

[sunli829]

examples is a sub-repository of async-graphql, so you need to clone async-graphql.

[sahina]

this should be part of on README.md. i can create a PR to add something like below to the root README.md

// `examples` is sub-repository of `async-graphql`.
git clone https://github.com/async-graphql/async-graphql.git
cd async-graphql
git clone https://github.com/async-graphql/examples.git