Porting PicoTCP WIP

kernel/picotcp/docs/user_manual/README.md

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+Downloading the manual
+----------------------
+
+With every git commit, we rebuild the documentation and make the [user_doc.pdf](http://162.13.84.104/user_doc.pdf) file (click to download) publicly available.
+
+If for some reason, you're looking for an older version of the documentation, please check out the wanted commit in git, and compile the manual as described below.
+
+Compiling the manual
+--------------------
+
+The picoTCP user manual is written in LaTeX, which needs to be compiled to get a readable version.
+First and foremost you need the compiler and some packages:
+* sudo apt-get install texlive
+* sudo apt-get install texlive-latex-extra
+
+Now, cd into docs/user_manual and do
+* ./build.sh
+
+A user_doc.pdf should be generated in the current directory
+