message: Document permissions view and example data
diff: @@ -18,6 +18,17 @@ AS
  psk.skid AS skid
  FROM project_ssh_key psk;
  +-- Permissions view for calculating what each SSH Key is allowed to view.
  +-- Example:
  +-- +--------+-------------------+-----------+------------------------------------+
  +-- | key_id | ssh_key | customers | projects |
  +-- +--------+-------------------+-----------+------------------------------------+
  +-- | 1 | ssh-rsa <key> | 1,2 | 2,1 |
  +-- | 2 | ssh-rsa <key> | NULL | NULL |
  +-- | 3 | ssh-rsa <key> | 1 | 1 |
  +-- | 4 | ssh-rsa <key> | 3 | 17,16,15,14,12,11,10,9,8,7,6,5,4,3 |
  +-- | 5 | ssh-ed25519 <key> | 3 | 17,16,15,14,12,11,10,9,8,7,6,5,4,3 |
  +-- +--------+-------------------+-----------+------------------------------------+
  DROP VIEW IF EXISTS permission;
  CREATE VIEW permission
  AS
  