Create SECURITY.md

Author: rtfpessoa

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.7.x   | :white_check_mark: |
+| < 2.7   | :x:                |
+
+## Reporting a Vulnerability
+
+We take all security bugs in `diff2html-cli` seriously.
+Thank you for the help improving the security of `diff2html-cli`.
+We appreciate your efforts and responsible disclosure and
+will make every effort to acknowledge your contributions.
+
+Report security bugs by emailing the lead maintainer at `rtfrodrigo [at] gmail [dot] com`.
+
+The lead maintainer will acknowledge your email within 48 hours, and will send a
+more detailed response within 48 hours indicating the next steps in handling
+your report. After the initial reply to your report, the security team will
+endeavor to keep you informed of the progress towards a fix and full
+announcement, and may ask for additional information or guidance.
+
+Report security bugs in third-party modules to the person or team maintaining
+the module.
+
+## Disclosure Policy
+
+When the security team receives a security bug report, they will assign it to a
+primary handler. This person will coordinate the fix and release process,
+involving the following steps:
+
+  * Confirm the problem and determine the affected versions.
+  * Audit code to find any potential similar problems.
+  * Prepare fixes for all releases still under maintenance. These fixes will be
+    released as fast as possible.
+
+## Comments on this Policy
+
+If you have suggestions on how this process could be improved please submit a
+pull request.