add .gitignore file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..31ef3a6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+*.o
+*.swp
+*.cfg*
+src/osmo-e1-recorder
+src/osmo-e1cap-dump