Create KiCAD.gitignore

Add file for KiCAD EDA software

KiCAD.gitignore

@@ -0,0 +1,11 @@
+# For PCBs designed using KiCAD: http://www.kicad-pcb.org/
+
+# Temporary files
+*.000
+*.bak
+
+# Netlist files (exported from Eeschema)
+*.net
+
+# Autorouter files (exported from Pcbnew)
+.dsn