Restore PRIVACY-POLICY.md for stable version.

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PRIVACY-POLICY.md

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+# Privacy Policy of PixelViewer
+- Version: 1.0.
+- Update: 2021/6/13.
+
+This is the privacy policy of ```PixelViewer``` which you need to read before you using ```PixelViewer```. 
+The privacy policy may be updated in the future and you can check it on the website of ```PixelViewer```. 
+We assume that you have agreed this privacy policy once you start using ```PixelViewer```.
+
+## Scope of Privacy Policy
+This privacy policy will be applied when you use ```PixelViewer```.
+
+## Collecting Your Personal Data
+We **DON'T** collect the following personal data:
+- User/Account name.
+- Computer name.
+- E-mail address.
+- IP address.
+- Geographical location.
+
+We **DO** collect the following data which may relate to your personal data:
+- Path/Name of files you open in ```PixelViewer``` or save in ```PixelViewer```.
+- Detailed information of application crashing.
+
+## Using Your Personal Data
+We **DON'T** have any usage of your personal data by default. All collected data mentioned in previous section are saved in your computer and we **WON'T** send or upload these data.
+We may ask your help to send these data to us by yourself **ONLY** for debugging purpose (ex, application crashing).
+You can check these data before you sending to us or you can also reject to send these data.
+
+## Contact Us
+If you have any concern of this privacy policy, please create an issue on [GitHub](https://github.com/carina-studio/PixelViewer/issues) or send e-mail to [[email protected]](mailto:[email protected]).