diff --git a/opensource/.gitignore b/opensource/.gitignore
new file mode 100644
index 0000000..c4b2425
--- /dev/null
+++ b/opensource/.gitignore
@@ -0,0 +1,8 @@
+# Editors.
+*.sw*
+.vscode
+.DS_Store
+
+# Build directory.
+build/
+out/