Create LyX.gitignore

Ignores *.lyx~ (crash recovery) and *.lyx# (timed autosave) files generated by LyX - the document processor.

Global/LyX.gitignore

@@ -0,0 +1,4 @@
+# Ignore LyX backup and autosave files
+# http://www.lyx.org/
+*.lyx~
+*.lyx#