Update README

README.md

@@ -1,6 +1,8 @@
 <div align="center">
   <img src="images/korax.png" alt="Korax" width="160"/>
 
+  <!-- TODO: Add App Screenshot showing native PGP workflows -->
+
   # Korax
 
   **PGP-First Email. Private by Default.**
@@ -17,6 +19,10 @@ Korax is an email client built around a single principle: **encryption should be
 
 Most clients bolt PGP on as an afterthought — a plugin, a hidden setting, a third-party extension. Korax is designed from the ground up so that signing, encryption, and key management are a seamless part of your everyday workflow. Your mail stays between you and the people you write to.
 
+### Why Korax?
+
+Default mail apps (like Apple Mail) cannot read or compose PGP encrypted emails natively. Korax was born out of simple frustration: the inability to easily read encrypted emails (such as Kraken security alerts) out of the box. Instead of fighting with extensions, Korax provides a first-class, zero-friction PGP experience.
+
 ---
 
 ## Features
@@ -118,6 +124,14 @@ The UI layer never blocks: all network and crypto operations run in Rust, commun
 
 The source is published here for transparency and community audit. It is licensed under the [PolyForm Noncommercial License 1.0.0](LICENSE) — free to read, study, and use for noncommercial purposes. Commercial use requires a separate agreement.
 
+#### Building & Testing `mailcore`
+To build and test the `mailcore` engine locally:
+```bash
+cd mailcore
+cargo build
+cargo test
+```
+
 **What stays proprietary:**
 
 The PGP/Sequoia integration, advanced privacy features, the proprietary Rust engine, and the Flutter UI (`korax/`) are not published.
@@ -126,9 +140,15 @@ The PGP/Sequoia integration, advanced privacy features, the proprietary Rust eng
 
 ## Security
 
+**Key storage:** Private keys are never written to SQLite or disk in plaintext. On every platform, they are stored in the OS secure enclave (iOS Keychain, macOS Keychain, Android Keystore).
+
+## Support & Contributing
+
+**Bug Reports:** Korax includes a built-in bug reporting feature directly within the application. Please use that for all general issues and feedback.
+
 **Reporting vulnerabilities:** Do not open a public issue. Contact the maintainer directly at the address shown in the application's About screen.
 
-**Key storage:** Private keys are never written to SQLite or disk in plaintext. On every platform, they are stored in the OS secure enclave (iOS Keychain, macOS Keychain, Android Keystore).
+**Contributing:** Core development is handled internally. At this time, we do not accept external pull requests or community code contributions.
 
 ---