Add missing .gitignore file.

asio/src/examples/cpp11/spawn/.gitignore

diff --git a/asio/src/examples/cpp11/spawn/.gitignore b/asio/src/examples/cpp11/spawn/.gitignore
new file mode 100644
index 0000000..0882fa6
--- /dev/null
+++ b/asio/src/examples/cpp11/spawn/.gitignore
@@ -0,0 +1,11 @@
+.deps
+.dirstamp
+*.o
+*.obj
+*.exe
+*_server
+*_client
+*.ilk
+*.manifest
+*.pdb
+*.tds