chore: add privacy policy document

Signed-off-by: Robert Goniszewski <robertgoniszewski@outlook.com>

Author: goniszewski

PRIVACY.md

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+## Our Privacy Policy
+
+We get it – privacy is important. That's why we've designed this Chrome extension to be as privacy-friendly as possible.
+
+Here's the deal:
+
+- **We don't collect any of your personal data.** That means no names, no emails, no browsing history – nothing that could identify you.
+- **This extension only talks to your own Grimoire API instance.** It doesn't send any data to third-parties or any mysterious servers.
+- **We won't track how you use the extension.** We want you to have full control over your experience.
+
+## Keeping it Simple
+
+We believe privacy policies shouldn't be complicated. If you have any questions, feel free to reach out to us at [your support email].
+
+## Changes
+
+We might update this policy if we make changes to the extension. We'll let you know if that happens!
+
+## Contact Us
+
+If you have any questions about this Privacy Policy, please contact us at contact@grimoire.pro.