add repo files (fixes #271)

Author: djmitche

.gitignore

@@ -11,3 +11,4 @@ coverage.*
 **/.vs
 **/.vscode
 **/.idea
+yarn.lock

CODE_OF_CONDUCT.md

@@ -0,0 +1,15 @@
+# Community Participation Guidelines
+
+This repository is governed by Mozilla's code of conduct and etiquette guidelines. 
+For more details, please read the
+[Mozilla Community Participation Guidelines](https://www.mozilla.org/about/governance/policies/participation/). 
+
+## How to Report
+For more information on how to report violations of the Community Participation Guidelines, please read our '[How to Report](https://www.mozilla.org/about/governance/policies/participation/reporting/)' page.
+
+<!--
+## Project Specific Etiquette
+
+In some cases, there will be additional project etiquette i.e.: (https://bugzilla.mozilla.org/page.cgi?id=etiquette.html).
+Please update for your project.
+-->

CONTRIBUTING.md

@@ -0,0 +1,5 @@
+# How to Contribute
+
+We welcome pull requests from everyone. We do expect everyone to adhere to the [Mozilla Community Participation Guidelines][participation].
+
+Note that this library is in "maintenance mode" -- we are not adding new features, although we will accept low-impact bug fixes and dependency upgrades.

SECURITY.md

@@ -0,0 +1,3 @@
+# Security Policy
+
+Mozilla has a [well-defined process for handling security vulnerabilities](https://www.mozilla.org/en-US/about/governance/policies/security-group/bugs/) based around responsible disclosure.