Add build package build step in README

README.md

@@ -158,6 +158,47 @@ Compiling with XCode is a little bit problematic, since it requires you to compi
 7. Build the XCode-Project and execute the created bundle
 
 
+Building the Debian Package
+---------------------------
+
+If you just need a `.deb`, simply do:
+
+    git checkout debian-master
+    fakeroot ./debian/rules binary
+
+And you're done! The `.deb` is in the directory at which you started.
+To show some info about it, try this:
+
+    dpkg --info telegram-purple_*.deb
+
+`debian-master` always points to a version that was submitted to Debian. (Note that this doesn't exist yet, as we haven't released to Debian yet.)
+`debian-develop` is the candidate for the next submission.
+
+#### Debian Maintainers ####
+
+If you're a maintainer (if you're not sure, then you aren't a
+maintainer), you need to produce a lot more files than that.
+
+Here's how you can generate a `.orig.tar.gz`:
+
+    debian/genorigtar.sh
+
+This command requires the original tar to exist (and will fail otherwise,
+although the error message will be misleading) will build all further files,
+specifically `.debian.tar.xz`,`.dsc`, `.deb`, and `.changes`:
+
+    dpkg-buildpackage
+
+And that already covers the official part of the work-flow. Of course,
+you can call small parts of the build process directly, in order to avoid
+overhead like rebuilding. For example, if you only need the `.debian.tar.xz`
+and `.dsc` files, do this:
+
+    debian/genorigtar.sh
+    ( cd .. && dpkg-source -b telegram-purple )
+
+Note that the parenthesis are important.
+
 Discussion / Help
 -----------------