Moneropedia: add Transports/SSU/NTCP

Referencing:
 - monero-project/kovri#256
 - monero-project/monero-site#155

knowledge-base/moneropedia/kovri.md

@@ -56,15 +56,20 @@ TODO(anonimal): finish
 
 @network-database
 
+@NTCP
+
 @reseed
 
 @router-info
 
+@SSU
+
 @subscription
 
+@transports
+
 @tunnel
 
 - Kovri Cryptography (encryption, signatures, etc.)
-- Kovri Transports (SSU/NTCP)
 - Kovri I2PControl (links to API, clients + qtoopie)
 - ...more/what else?

knowledge-base/moneropedia/ntcp.md

@@ -0,0 +1,15 @@
+---
+layout: moneropedia
+entry: "NTCP"
+tags: ["kovri"]
+terms: ["NTCP"]
+summary: "TODO(anonimal): finish"
+---
+
+### The Basics
+
+TODO(anonimal): finish
+
+### In-depth information
+
+TODO(anonimal): finish

knowledge-base/moneropedia/ssu.md

@@ -0,0 +1,27 @@
+---
+layout: moneropedia
+entry: "SSU"
+tags: ["kovri"]
+terms: ["SSU"]
+summary: "I2P's Secure Semi-reliable UDP layer"
+---
+
+### The Basics
+
+*Secure Semi-reliable UDP* (SSU) is one of two encrypted @transport layers for @Kovri/@I2P.
+
+SSU's *primary* purpose is to securely transmit @in-net @I2NP messages through @tunnels over encrypted [UDP](https://en.wikipedia.org/wiki/User_Datagram_Protocol).
+
+### In-depth information
+
+- Much like its @NTCP counterpart, SSU is a connection-oriented, point-to-point data transport
+- Termed *semi-reliable* because SSU will repeatedly retransmit *unacknowledged* messages (up to maximum number then dropped)
+- SSU also provides several unique services (in addition to its function as a @transport layer):
+  - IP detection (local inspection + peer testing)
+  - NAT traversal (using introducers)
+  - Firewall status
+  - If implemented, SSU can notify NTCP if the external address or firewall status changes
+
+### Notes
+
+For further details, read @Java-I2P's [SSU](https://geti2p.net/en/docs/transport/ssu)

knowledge-base/moneropedia/transports.md

@@ -0,0 +1,15 @@
+---
+layout: moneropedia
+entry: "Transports"
+tags: ["kovri"]
+terms: ["transports", "transport"]
+summary: "TODO(anonimal): finish"
+---
+
+### The Basics
+
+TODO(anonimal): finish
+
+### In-depth information
+
+TODO(anonimal): finish

knowledge-base/moneropedia/tunnel.md

@@ -2,7 +2,7 @@
 layout: moneropedia
 entry: "Tunnel"
 tags: ["kovri"]
-terms: ["tunnel"]
+terms: ["tunnel", "tunnels"]
 summary: "TODO(anonimal): finish"
 ---