Add maintainer and contributing information (#57)

* Create contributing.md

* Create maintainers.md

* Add slack link

* edit channel

contributing.md

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+## Contributing
+
+This is an open source project, and we appreciate your help!
+
+We use the GitHub issue tracker to discuss new features and non-trivial bugs. In addition to the issue tracker, the [#appid-at-ibm Slack channel](https://ibm-cloud-success.slack.com/) is an easy way to get in touch with the maintainers.
+
+To contribute code, documentation, or tests, please submit a pull request to the GitHub repository. Generally, we expect two maintainers to review your pull request before it is approved for merging. For more details, see the MAINTAINERS page.

maintainers.md

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+## Maintainers
+
+This file lists the official maintainers of the App Identity and Access Adapter project. Check out the following list to see who needs to review your pull request. Two maintainer approvals are required to merge a change.
+
+| Role | Person | GH ID |
+|------|------|---------|
+| Architect | Anton Aleksandrov | @aal80 |
+| Architect | Tal Aviel | @TalAviel |
+| Development | Ishan Gulhane | @ishangulhane |
+| Development | Kimmy Taft | @kimmytaft |
+| Development | Joyce Huang | @huangjoyce3 |
+| Documentation | Shawna Guilianelli | @smguilia |
+
+
+## Past Maintainers
+This is kept as a 'thank you' for the contributions of past maintainers.
+
+Aaron Libertore
+Anup Rokkam