Create SECURITY.md

SECURITY.md

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+bitwarden believes that working with security researchers across the globe is crucial to keeping our
+users safe. If you believe you've found a security issue in our product or service, we encourage you to
+notify us. We welcome working with you to resolve the issue promptly. Thanks in advance!
+
+# Disclosure Policy
+
+- Let us know as soon as possible upon discovery of a potential security issue, and we'll make every
+  effort to quickly resolve the issue.
+- Provide us a reasonable amount of time to resolve the issue before any disclosure to the public or a
+  third-party. We may publicly disclose the issue before resolving it, if appropriate. 
+- Make a good faith effort to avoid privacy violations, destruction of data, and interruption or
+  degradation of our service. Only interact with accounts you own or with explicit permission of the
+  account holder.
+
+# In-scope
+
+- Security issues in any current release of bitwarden. This includes the web vault, browser extension,
+  and mobile apps (iOS and Android). Product downloads are available at https://bitwarden.com. Source
+  code is available at https://github.com/bitwarden.
+
+# Exclusions
+
+The following bug classes are out-of scope:
+
+- Bugs that are already reported on any of bitwarden's issue trackers (https://github.com/bitwarden),
+  or that we already know of. Note that some of our issue tracking is private.
+- Issues in an upstream software dependency (ex: Xamarin, ASP.NET) which are already reported to the
+  upstream maintainer.
+- Attacks requiring physical access to a user's device.
+- Self-XSS
+- Issues related to software or protocols not under bitwarden's control
+- Vulnerabilities in outdated versions of bitwarden
+- Missing security best practices that do not directly lead to a vulnerability
+- Issues that do not have any impact on the general public
+
+While researching, we'd like to ask you to refrain from:
+
+- Denial of service
+- Spamming
+- Social engineering (including phishing) of bitwarden staff or contractors
+- Any physical attempts against bitwarden property or data centers
+
+Thank you for helping keep bitwarden and our users safe!