draft initial CONTRIBUTING guide (#567)

This guide was adopted from the node.js project.

1 files changed, 23 insertions, 0 deletions

diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
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+<!--
+Thank you for your Pull Request. Please provide a description above and review
+the requirements below.
+
+Bug fixes and new features should include tests.
+
+Contributors guide: https://github.com/tokio-rs/tokio/blob/master/CONTRIBUTING.md
+-->
+
+## Motivation
+
+<!--
+Explain the context and why you're making that change. What is the problem
+you're trying to solve? In some cases there is not a problem and this can be
+thought of as being the motivation for your change.
+-->
+
+## Solution
+
+<!--
+Summarize the solution and provide any necessary context needed to understand
+the code change.
+-->