Added cheat sheet for irssi

cheatsheets/irssi

@@ -0,0 +1,26 @@
+# To connect to an IRC server
+/connect <server domain name>
+
+# To join a channel
+/join #<channel name>
+
+# To set a nickname
+/nick <my nickname>
+
+# To send a private message to a user
+/msg <nickname>
+
+# To close the current channel window
+/wc
+
+# To switch between channel windows
+ALT+<number>, eg. ALT+1, ALT+2
+
+# To list the nicknames within a channel
+/names
+
+# To change the topic
+/topic <description>
+
+# To quit irssi
+/exit