add quick ubuntu packaging documentation

Ubuntu-Packaging.md

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+=== BUILD PACKAGES ===
+
+You can build ubuntu packages with just 2 steps for Ubuntu series  `yakkety`, `wily`, `xenial` and  `trusty`.
+
+Before run the script `scripts/ubuntu-build.sh` you must have:
+ - a valid gpg key associated with your email address
+ - an account on launchpad.net where upload packages with the configured public gpg key
+ - set the two environment variables `DEBFULLNAME` and `DEBEMAIL` to your full name and your email used in your email address in the form "`<DEBFULLNAME>` <`<DEBEMAIL>`>"
+
+Use the flag `-d` to build a development package; if you want to build an official version manage the `debian/changelog` file by hand.
+
+After that follow what the script tell you to upload packages.
+
+=== UPDATE PATCHES (IF EXISTS) ===
+
+To manage debian patches you must use the `quilt` package, check documentation about it.
+