Add way of working for leaving laptops unattended

docs/adrs/0017-laptop-security.md

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+# ADR-0017 Laptop Security
+
+## Context
+
+When people leave their laptop open and unlocked this could be a big security breach, especially when you have SSO on
+for multiple services. 
+
+## Decision
+
+Whenever a colleague will find your laptop open and unlocked, they will message in the `random` Mattermost channel to
+bring cookies and cake to the office the next thursday as a way of compensation.
+
+## Risks
+
+- We could have a big security breach if people leave their laptops unlocked and unmanaged.
+- People could become less healthy by eating many cookies.