Add logging submodule (from Patternslib)

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "Libraries/logging"]
+	path = Libraries/logging
+	url = https://github.com/Patternslib/logging.git

Libraries/logging

@@ -0,0 +1 @@
+Subproject commit 1dbed4ac2d34276e7e2b438118214c417ebe5691