doc: add "Move account" basic documentation

doc/Account-Basics.md

@@ -73,5 +73,7 @@ You can export a copy of your personal data in XML format from the "Export perso
 
 * [Groups and Privacy](help/Groups-and-Privacy)
 
+* [Move Account](help/Move-Account)
+
 * [Remove Account](help/Remove-Account)
 

doc/Home.md

@@ -14,6 +14,7 @@ Friendica Documentation and Resources
 * [Groups and Privacy](help/Groups-and-Privacy)
 * [Tags and Mentions](help/Tags-and-Mentions)
 * [Pages](help/Pages)
+* [Move Account](help/Move-Account)
 * [Remove Account](help/Remove-Account)
 * [Bugs and Issues](help/Bugs-and-Issues)
 

doc/Move-Account.md

@@ -0,0 +1,33 @@
+Move Account
+============
+
+* [Home](help)
+
+
+! **this is an experimental feature**
+
+** How to move an account between servers **
+
+Go to "Settings" -> "[Export personal data](uexport)"
+Click on "Export account" to save your account data.
+This file contains your details, your contacts, groups, and personal settings.
+It contains also your secret keys to authenticate yourself to your contacts:
+**save this file in a secure place**!
+
+Go to your new server, and open *http://newserver.com/uimport* (there is not a 
+direct link to this page at the moment).
+
+Load your saved account file and click "Import".
+
+Friendica will recreate your account on new server, with your contacts and groups.
+A message is sent to Friendica contacts, to inform them about your move: if your
+contacts are runnning on an updated server, automatically your details on their
+side will be updated.
+Contacts on Statusnet/Identi.ca or Diaspora will be archived, as we can't inform
+them about your move.
+You should ask them to remove your contact from their lists and readd you, and you
+should do the same with their contact.
+
+After the move, the account on the old server will not work reliably anymore, and
+should be not used.
+