Add privacy policy (#14)

Co-authored-by: James Mills <prologic@shortcircuit.net.au>
Reviewed-on: #14
Reviewed-by: mearaj <mearaj@noreply@mills.io>
Co-authored-by: James Mills <james@mills.io>
Co-committed-by: James Mills <james@mills.io>

index.md

@@ -107,6 +107,20 @@ at https://git.mills.io/saltyim/
 We have an IRC channel `#salty.im` on the [Libera.Chat](https://libera.chat/)
 IRC network. You are welcome to come chat to us, hang out and get involved!
 
+## 🕵️‍♂️ PrivacyPolicy
+
+Salty.IM is a decentralised instant messaging protocol inspired by
+[IndieWeb](https://indieweb.org/) and [Twtxt](https://twtxt.readthedocs.io/en/latest/)
+and accompanying project of [Yarn.social](https://yarn.social).
+
+Like Yarn.social there is a reference broker (server) and client(s) such as the
+command-line client `salty-chat` and a mobile app.
+
+The privacy policy therefore only strictly applies to the reference broker and
+clients (including the mobile app) built and provided by the Salty.Im developers.
+
+- [Privacy Policy](/privacy.html)
+
 ## 👨‍⚖️ License
 
 Salty IM and Salty Chat are licensed under the terms of the MIT License.

privacy.md

@@ -0,0 +1,39 @@
+---
+title: Salty.im Privacy Policy
+keywords: salty, im, instant, messaging, chat, protocol, secure, encrypted, e2e
+---
+
+# Privacy Policy
+
+This is aimed to be the world's simplest privacy policy.
+This document should explain to you why the app collects some
+information, what happens when your account is deleted and some other
+frequently asked questions answered regarding your privacy.
+
+If you have any more questions, please raise an issue regarding
+the same on our [Issue Tracker](https://git.mills.io/saltyim/saltyim/issues/new)
+and I'll answer as honest and quickly as possible :)
+
+<details>
+  <summary>What identifiable information is stored about me?</summary>
+  <p>
+    Your desired username or alias and your domain name. This information is stored
+    in your Salty.im client aid in identifying who you are and to indicate to
+    peers whom they are communicating with. Your `<username>@<domain>` is known
+    as your Salty Address and is also published to a broker by taking a SHA256
+    hash of the address and using this hash to publish your public keys for
+    discovery purposes.
+  </p>
+</details>
+
+<details>
+  <summary>How is this all free? There must be a catch!</summary>
+  <p>
+    Absolutely no catch to this freebie. This project is just my way of
+    giving back to the community that I've learned so much from. If you'd
+    like to show your appreciation however, you can follow me on my social
+    media and let me know how much it helped you, or donate to help pay
+    the cloud bills, or if you are a fellow developer, you can head to
+    git.mills.io and contribute to the code by raising a PR.
+  </p>
+</details>