Ignore some files that are automatically generated in the project (#41)

Signed-off-by: xiaolong.ran <ranxiaolong716@gmail.com>
diff --git a/.gitignore b/.gitignore
index 723ef36..b37e915 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,11 @@
-.idea
\ No newline at end of file
+# IDE generated files
+.idea/
+
+# Mac swap file
+*.DS_Store
+
+# Linux swap file
+*.swp
+
+# Output of the go coverage tool
+*.out