Initial git import

ミラー元 https://github.com/boxtec/bb-shield-adapter
diff --git a/BB-shield-adapter.brd b/BB-shield-adapter.brd
Boxtec 0164f7bd3c Initial git import		8年前
BB-shield-adapter.brd	Initial git import	8年前
BB-shield-adapter.sch	Initial git import	8年前
README.md	Initial git import	8年前