As of the 29th August 2019, the Hyperledger Composer project is in deprecated status. None of the maintainers are actively developing new features. None of the maintainers are actively providing support via GitHub issues. However, if you wish to submit code changes via pull requests, these will be merged.
It is highly recommended that you use Hyperledger Fabric v1.4+ instead, which features significant improvements to the developer experience, including a new programming model.
More information available here: What's new in Hyperledger Fabric v1.4
Composer knowledge base / Wiki to host resolutions or answers to common questions/issue Composer users encounter,(FAQ). It also hosts useful tips, how-tos or example snippets