Add readme

README.md

@@ -0,0 +1,7 @@
+# iOS/Swift library class to write and read text to Keychain
+
+### Reference
+
+The code is based on this gist:
+
+[https://gist.github.com/s-aska/e7ad24175fb7b04f78e7](https://gist.github.com/s-aska/e7ad24175fb7b04f78e7)