Added more info about XMPP

rocks/computers/software/xmpp.md

@@ -1,28 +1,37 @@
-# xmpp is the best software protocol out there
+# xmpp is the instant messaging protocol out there¹
 
-I have my reasons:
+The Extensible Messaging Presence Protocol (XMPP) is a messaging
+protocol which allows you to... exchange message with a chat partner
+and know if said partner is online, busy, away... At its core it is
+very minimal. But as its name says, it is extensible so there are
+extensions like multi user chats (MUCs) OpenPGP encryption, OMEMO
+encryption, OTR encryption, profile pictures...
 
-## Descentralization
+As it is a protocol rather than a software. There are a lot of clients
+to choose from. To name a few, dino, gajim, profanity (for linux),
+conversations for android, monal for the apple garbage...
+
+# Descentralization
 
 You and your friend can setup their own xmpp server and a server to
 server communication will be made. (yourdomain.tld -> frendomain.tld)
 just like emails. So the messages aren't centralizated. Making it good
 for privacy
 
-## Easy encryption
+# Easy encryption
 
 xmpp supports [OMEMO](https://xmpp.org/extensions/xep-0384.html) and
 [OpenPGP](https://xmpp.org/extensions/xep-0027.html) encryption. This
 plus centralization makes it perfect for privacy.
 
-## xmpp advantages over WhatApp
+# xmpp advantages over WhatsApp
 
 * Not run by F\*ceb\*ok
 * Descentralizated
 * You can run your server
 * Does not require phone number
 
-## xmpp advantages over Telegram
+# xmpp advantages over Telegram
 
 * not run by a russian mobster
 * Descentralizated
@@ -30,14 +39,13 @@ plus centralization makes it perfect for privacy.
 * You can setup your own server
 * Does not require phone number
 
-## xmpp advantages over Signal
+# xmpp advantages over Signal
 
 * Does not require phone number (kek, a privacy oriented software
   requires your phone number)
 * You can trust the encryption
 * You can setup your own server
 
-## xmpp flaws
-
-Every client sucks
+# xmpp flaws
 
+Every client sucks