Add mandatory files for code of conduct, support, and security (#175)

Author: leplatrem

CODE_OF_CONDUCT.md

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+# Code of conduct
+
+This repository is governed by Mozilla's code of conduct and etiquette guidelines. For more details please see the [Mozilla Community Participation Guidelines](https://www.mozilla.org/about/governance/policies/participation/) and [Developer Etiquette Guidelines](https://bugzilla.mozilla.org/page.cgi?id=etiquette.html).

SECURITY.md

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+# 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.
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| v3.x.x  | :white_check_mark: |
+| < v3.0  | :x:                |
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability, you should visit the [Mozilla bug bounty program](https://www.mozilla.org/en-US/security/bug-bounty/) for information on how to submit them.
+
+[This Bugzilla template](https://bugzilla.mozilla.org/enter_bug.cgi?assigned_to=nobody%40mozilla.org&bug_ignored=0&bug_severity=--&bug_status=NEW&bug_type=defect&cf_fx_iteration=---&cf_fx_points=---&component=SRE&contenttypemethod=list&contenttypeselection=text%2Fplain&defined_groups=1&filed_via=standard_form&flag_type-4=X&flag_type-607=X&flag_type-674=X&flag_type-800=X&flag_type-803=X&flag_type-936=X&form_name=enter_bug&groups=releng-security&groups=mozilla-employee-confidential&groups=partner-confidential&maketemplate=Remember%20values%20as%20bookmarkable%20template&op_sys=Unspecified&priority=--&product=Infrastructure%20%26%20Operations&rep_platform=Unspecified&target_milestone=---&version=unspecified) will help you file a security vulnerability directly against Kinto (Remote Settings at Mozilla).

SUPPORT.md

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+# Support
+
+If you're looking for support for JBI, check out:
+
+* `#jbi` on mozilla.slack.com