Management: add ROADMAP.md

ROADMAP.md

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+# go-i2p Implementation Roadmap
+
+## Transport Layer (NTCP2)
+- Build on existing lib/transport/noise implementation
+- Core NTCP2 components:
+  * Session handshake using noise protocol
+  * Connection management
+  * I2NP message transport
+
+## Reseed System
+- SU3 file format implementation:
+  * Format parsing and validation(Much of this work is done in reseed-tools, may need to be moved here)
+  * Signature verification system(Much of this work is done in reseed-tools, may need to be moved here)
+- Local reseed functionality:
+  * File-based reseed operations
+- Self-signed/Package-pinned X.509 certificate handling for reseed validation
+
+## NetDb and Database Store
+- Database Store message handling:
+  * Message structure implementation
+  * Message handling implementation
+- NetDb core implementation:
+  * RouterInfo management
+  * LeaseSet management
+  * Lookup system
+  * Storage interface
+  * Peer selection logic?(Maybe do something very basic for now like i2pd used to do, and then improve it later, the important part will be interface design at first)
+
+## Tunnel Implementation
+- Tunnel cryptography:
+  * Key generation and management
+  * Layered encryption scheme
+- Message processing:
+  * Build request/response handling
+  * Gateway implementation
+  * Message forwarding logic
+
+Notes:
+- Excluding legacy protocols (SSU1, NTCP1, elgamal, DSA)
+- Leveraging existing noise protocol implementation
+- SSU2 is not on this roadmap but is fair game for implementation as soon as NTCP2 is done. We're focused on NTCP2 to get this thing sending I2NP messages.