add basic gitignore
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2f4b72a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,13 @@
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+# Carthage
+Carthage/Build