Add .gitignore

BUG=chromium-os:20453
TEST=none

Change-Id: I23563ebc815300907e6e8059662258c864a0ade4
Signed-off-by: Che-Liang Chiou <[email protected]>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a310b18
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+# Normal rules
+*.swp
+
+# Top-level generic files
+/build