Add starter tasks to readme, close #754
Add starter tasks to readme, close #754

Summary:
Issue fixed: #754

- [ ] All tests pass. Demo project builds and runs.
- [ ] I added tests, an experiment, or detailed why my change isn't tested.
- [ ] I added an entry to the `CHANGELOG.md` for any breaking changes, enhancements, or bug fixes.
- [ ] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/master/.github/CONTRIBUTING.md)
Closes https://github.com/Instagram/IGListKit/pull/756

Differential Revision: D5103956

Pulled By: rnystrom

fbshipit-source-id: 212f7b3b7d7a8616d774f787fcb2e7cecf72d0db

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