trigboard v7 case

I use the [TrigBoard v7](https://www.kevindarrah.com/wiki/index.php?title=TrigBoardV7) created by Kevin Darrah for monitoring the locks on our office doors so we can make sure they are correctly locked at the end of the day. The TrigBoard is distinguished by its long battery life; our busiest sensor sends about 1000 notifications/month and the 1100 mAH LiPo battery lasts 6 months.

This case houses the v7 TrigBoard and a [1100 mAH LiPo battery from Core Electronics](https://core-electronics.com.au/polymer-lithium-ion-battery-1000mah-38458.html)

The case is in two parts; a base which is mounted to the door or wall, and the cover which snaps on. A single screw can be used to retain the cover, although it fits pretty snugly. The other hole in the lid is for viewing the blue activity led on the TrigBoards.