more entries in the catalog ; more readme and faq ; onging impl

DESIGN.md

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+
+## arguments
+
+* argparse : the standard way
+* getopt : for C users
+* baker : decorator overs functions
+* [docopt](http://docopt.org/) : CLI description language ; python 3.6 ! ; nim port available
+
+## TUI
+
+* must display tables
+* must display progress bar
+
+## semver
+
+
+* pip install semver https://pypi.org/project/semver/, https://github.com/python-semver/python-semver/releases
+* pip install python-semanticversion
+* most pakging tool : packaging https://packaging.pypa.io/en/latest/version.html, setuptool, distutils
+
+## arch
+
+use `os.uname()`
+
+## downloader
+
+* requests
+
+## install
+
+* unpack in ~/.local/programs/<cli>
+* link exe in ~/.local/bin
+
+
+
+