Properly add security policy (#6163)

* Create SECURITY.md

* Update SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| Latest  | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+We’re extremely grateful for security researchers and users that report vulnerabilities to Netdata Open Source Community. All reports are thoroughly investigated by a set of community volunteers.
+
+To make a report, please create a post [here](https://groups.google.com/a/netdata.cloud/forum/#!newtopic/security) with the vulnerability details and the details expected for [all Netdata bug reports](.github/ISSUE_TEMPLATE/bug_report.md).
+
+### When Should I Report a Vulnerability?
+
+- You think you discovered a potential security vulnerability in Netdata
+- You are unsure how a vulnerability affects Netdata
+- You think you discovered a vulnerability in another project that Netdata depends on (e.g. python, node, etc)
+
+### When Should I NOT Report a Vulnerability?
+
+- You need help tuning Netdata for security
+- You need help applying security related updates
+- Your issue is not security related
+
+### Security Vulnerability Response
+
+Each report is acknowledged and analyzed by Netdata Team members within 3 working days. This will set off a Security Release Process.
+
+Any vulnerability information shared with Netdata Team stays within Netdata project and will not be disseminated to other projects unless it is necessary to get the issue fixed.
+
+As the security issue moves from triage, to identified fix, to release planning we will keep the reporter updated.
+
+### Public Disclosure Timing
+
+A public disclosure date is negotiated by the Netdata team and the bug submitter. We prefer to fully disclose the bug as soon as possible once a user mitigation is available. It is reasonable to delay disclosure when the bug or the fix is not yet fully understood, the solution is not well-tested, or for vendor coordination. The timeframe for disclosure is from immediate (especially if it's already publicly known) to a few weeks. As a basic default, we expect report date to disclosure date to be on the order of 7 days. The Netdata team holds the final say when setting a disclosure date.
+
+### Security Announcements
+
+Every time a security issue is fixed in Netdata, we immediately release a new version of it. So, to get notified of all security incidents, please subscribe to our releases on github.
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fdocs%2FSECURITY&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()