added gitignore

.gitignore

@@ -0,0 +1,15 @@
+receiver/obj/*
+sender/obj/*
+receiver/bin/*
+sender/bin/*
+*.layout
+*.cscope_file_list
+*.depend
+
+*kicad_prl
+*-bak
+*-backups
+*-cache*
+*-bak*
+_autosave*
+\#auto_saved_files\#