[nspcc-dev#37] storage: Add multiaddress format

Signed-off-by: Pavel Karpy <[email protected]>

03-storage/00-intro.md

@@ -1,2 +1,23 @@
 \newpage
 # Storage Nodes
+
+## Address format
+
+NeoFS uses \Gls{MultiAddr} format in a human-readable string version as a Node address in `netmap`. Any new node must provide correct \Gls{MultiAddr} on bootstrap stage. After bootstrap, addresses are verified by `IR` before new Node is a part of `netmap`.
+
+Correct address *composition* and *order*:
+
+1. Network layer(`dns4`, `ip4` or `ip6`);
+2. Transport layer(`tcp`);
+3. Presentation layer(`tls`) - optional, may be absent.
+
+### Examples:
+
+#### Correct
+- `/dns4/somehost/tcp/80/tls`;
+- `/ip4/1.2.3.4/tcp/80`.
+
+#### Incorrect
+- `/tcp/80/ip4/1.2.3.4`;
+- `/tls/ip4/1.2.3.4/tcp/80`;
+- `/ip4/1.2.3.4/dns4/somehost/tcp/80`.