signald <https://gitlab.com/signald/signald> proof of concent

can receive from signald groupv2, but nothing else

gateway/bridgemap/bsignald.go

@@ -0,0 +1,11 @@
+// +build !nosignald
+
+package bridgemap
+
+import (
+	bsignald "github.com/42wim/matterbridge/bridge/signald"
+)
+
+func init() {
+	FullMap["signald"] = bsignald.New
+}