Add .github docs

.github/contributing.md

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+# Contributors Guide
+
+Interested in contributing? Awesome! Before you do though, please read our
+[Code of Conduct](https://slackhq.github.io/code-of-conduct). We take it very seriously, and expect that you will as
+well.
+
+There are many ways you can contribute! :heart:
+
+### Bug Reports and Fixes :bug:
+-  If you find a bug, please search for it in the [Issues](https://github.com/slackapi/bolt/issues), and if it isn't already tracked,
+   [create a new issue](https://github.com/slackapi/bolt/issues/new). Fill out the "Bug Report" section of the issue template. Even if an Issue is closed, feel free to comment and add details, it will still
+   be reviewed.
+-  Issues that have already been identified as a bug (note: able to reproduce) will be labelled `bug`.
+-  If you'd like to submit a fix for a bug, [send a Pull Request](#creating_a_pull_request) and mention the Issue number.
+  -  Include tests that isolate the bug and verifies that it was fixed.
+
+### New Features :bulb:
+-  If you'd like to add new functionality to this project, describe the problem you want to solve in a [new Issue](https://github.com/slackapi/bolt/issues/new).
+-  Issues that have been identified as a feature request will be labelled `enhancement`.
+-  If you'd like to implement the new feature, please wait for feedback from the project
+   maintainers before spending too much time writing the code. In some cases, `enhancement`s may
+   not align well with the project objectives at the time.
+
+### Tests :mag:, Documentation :books:, Miscellaneous :sparkles:
+-  If you'd like to improve the tests, you want to make the documentation clearer, you have an
+   alternative implementation of something that may have advantages over the way its currently
+   done, or you have any other change, we would be happy to hear about it!
+  -  If its a trivial change, go ahead and [send a Pull Request](#creating_a_pull_request) with the changes you have in mind.
+  -  If not, [open an Issue](https://github.com/slackapi/bolt/issues/new) to discuss the idea first.
+
+If you're new to our project and looking for some way to make your first contribution, look for
+Issues labelled `good first contribution`.
+
+## Requirements
+
+For your contribution to be accepted:
+
+- [x] You must have signed the [Contributor License Agreement (CLA)](https://cla-assistant.io/slackapi/bolt).
+- [x] The test suite must be complete and pass.
+- [x] The changes must be approved by code review.
+- [x] Commits should be atomic and messages must be descriptive. Related issues should be mentioned by Issue number.
+
+If the contribution doesn't meet the above criteria, you may fail our automated checks or a maintainer will discuss it with you. You can continue to improve a Pull Request by adding commits to the branch from which the PR was created.
+
+[Interested in knowing more about about pull requests at Slack?](https://slack.engineering/on-empathy-pull-requests-979e4257d158#.awxtvmb2z)
+
+## Creating a Pull Request
+
+1.  :fork_and_knife: Fork the repository on GitHub.
+2.  :runner: Clone/fetch your fork to your local development machine. It's a good idea to run the tests just
+    to make sure everything is in order.
+3.  :herb: Create a new branch and check it out.
+4.  :crystal_ball: Make your changes and commit them locally. Magic happens here!
+5.  :arrow_heading_up: Push your new branch to your fork. (e.g. `git push username fix-issue-16`).
+6.  :inbox_tray: Open a Pull Request on github.com from your new branch on your fork to `master` in this
+    repository.
+
+## Maintainers
+
+There are more details about processes and workflow in the [Maintainer's Guide](./maintainers_guide.md).

.github/issue_template.md

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+### Description
+
+Describe your issue here.
+
+### What type of issue is this? (place an `x` in one of the `[ ]`)
+- [ ] bug
+- [ ] enhancement (feature request)
+- [ ] question
+- [ ] documentation related
+- [ ] testing related
+- [ ] discussion
+
+### Requirements (place an `x` in each of the `[ ]`)
+* [ ] I've read and understood the [Contributing guidelines](https://github.com/slackapi/bolt/blob/master/.github/contributing.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).
+* [ ] I've searched for any related issues and avoided creating a duplicate issue.
+
+---
+
+### Bug Report
+
+Filling out the following details about bugs will help us solve your issue sooner.
+
+#### Reproducible in:
+
+package version:
+
+node version:
+
+OS version(s):
+
+#### Steps to reproduce:
+
+1.
+2.
+3.
+
+#### Expected result:
+
+What you expected to happen
+
+#### Actual result:
+
+What actually happened
+
+#### Attachments:
+
+Logs, screenshots, screencast, sample project, funny gif, etc.

.github/pull_request_template.md

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+###  Summary
+
+Describe the goal of this PR. Mention any related Issue numbers.
+
+### Requirements (place an `x` in each `[ ]`)
+
+* [ ] I've read and understood the [Contributing Guidelines](https://github.com/slackapi/bolt/blob/master/.github/contributing.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).