diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5261c03
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,12 @@
+.DS_Store
+ 
+# XCode files
+*.mode1
+*.mode1v3
+*.mode2v3
+*.perspective
+*.perspectivev3
+*.pbxuser
+*.xcworkspace
+*.xcuserstate
+xcuserdata
\ No newline at end of file
diff --git a/README.md b/README.md
index 820731a..57af312 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,6 @@ Calcolatrice standard e scientifica in Obj-c/Cocoa
 ### Informazioni
 Una semplice calcolatrice. 
 Primo tentativo di applicazione in Cocoa.
+
+### Anteprima
+![screenshot](https://raw.github.com/Rnhmjoj/Calcolatrice/master/Screenshot.png)
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diff --git a/Screenshot.png b/Screenshot.png
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index 0000000..75d7ebf
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