book: added port numbers

doc/src/SUMMARY.md

@@ -3,6 +3,7 @@
 [DarkFi](README.md)
 - [Ideology](IDEOLOGY.md)
 - [Development](development.md)
+- [Port ranges](portranges.md)
 - [Architecture](architecture/architecture.md)
   - [Overview](architecture/overview.md)
   - [Layers](architecture/layers.md)

doc/src/portranges.md

@@ -0,0 +1,8 @@
+# P2P port ranges
+
+Standard port ranges used by DarkFi.
+
+* darkfid-sync: 33032
+* darkfid-consensus: 33033
+* ircd: 25551
+* taud: 23331