add security and license files

LICENSE.md

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+# The MIT License
+
+Copyright 2024 Statistisk sentralbyrå - Statistics Norway
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.

SECURITY.md

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+# Security Policy
+
+SSB takes the security of our software products and services seriously, which
+includes all source code repositories managed through our GitHub organization.
+
+We believe that responsible disclosure of security vulnerabilities helps us ensure
+the security and privacy of all our users.
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability in any of SSB's GitHub
+repositories, please report it to us using the [Github Private vulnerability reporting tool](https://github.com/statisticsnorway/dapla-ctrl/security/advisories).