Add convenience methods to append event and pubkey references

sig/nostr/event.rbs

@@ -3,25 +3,37 @@ module Nostr
     attr_reader pubkey: String
     attr_reader created_at: Integer
     attr_reader kind: Integer
-    attr_reader tags: Array[String]
+    attr_reader tags: Array[Array[String]]
     attr_reader content: String
     attr_accessor id: String?|nil
     attr_accessor sig: String?|nil
 
-    def initialize: (pubkey: String, kind: Integer, content: String, ?created_at: Integer, ?tags: Array[String], ?id: String|nil, ?sig: String|nil) -> void
-    def serialize: -> [Integer, String, Integer, Integer, Array[String], String]
+    def initialize: (
+      pubkey: String,
+      kind: Integer,
+      content: String,
+      ?created_at: Integer,
+      ?tags: Array[Array[String]],
+      ?id: String|nil,
+      ?sig: String|nil
+    ) -> void
+
+    def serialize: -> [Integer, String, Integer, Integer, Array[Array[String]], String]
 
     def to_h: -> {
       id: String?|nil,
       pubkey: String,
       created_at: Integer,
       kind: Integer,
-      tags: Array[String],
+      tags: Array[Array[String]],
       content: String,
       sig: String?|nil
     }
     def ==: (Event other) -> bool
 
     def sign:(String) -> Event
+
+    def add_event_reference: (String) -> Array[Array[String]]
+    def add_pubkey_reference: (String) -> Array[Array[String]]
   end
 end