Created howto (markdown)

wiki/howto.md

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+### How to work with this Wiki
+
+The syntax of the markup is relatively easy and is documented here http://daringfireball.net/projects/markdown/dingus. When you create a new Page then make sure to put some thinking into the right tree structure and then just extend the URL above. 
+
+**ATTENTION**: 
+
+* Make sure to always have _wiki/_ as the base path. So if you want to create `server/SystemBoot` then the correct URL is `wiki/server/SystemBoot`. Make sure to add you Page to the Table of Contents below by editing the document.
+
+* Password can be found in the encrypted page [[Passwords|wiki/passwords]]. You can decrypt it by using `gpg -d < passwords.md` after having entered the password. If you want to edit, first decrypt and then encrypt again using `gpg -a --symmetric passwords.md`. Make sure to never save the unencrypted version!
+
+If you have any questions then either contact Axel Uhl, Jens Rommel, Frank Mittag or Simon Pamiés.