Added privacy policy

store/privacy_policy.md

@@ -0,0 +1,3 @@
+# Privacy Policy #
+
+The UWP Experiences sample apps respect the privacy of its users and will not collect any user data, market to its user's clients, advertise to, or contact them for any other means. Some sample features may use third party services (Facebook and Twitter login, Cognitive Services Face and Language services) which may require users to provide certain information to access their services, but these features are not required for the samples to work.