Add .gitignore for binaries
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5a94d47
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.mmc.o.d
+.mmc_cmds.o.d
+mmc
+mmc.o
+mmc_cmds.o