Add readme dealing with translations

- Clarify relation between individual repositories containing translations
- Explain how to use zanata interface on a few important use-cases

README.translations

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+policycoreutils translations currently live in the following locations:
+
+- https://fedora.zanata.org/project/view/selinux
+  - contains translations for both stable (Red Hat Enterprise Linux) and master (Fedora) branches
+  - maintains large number of languages (several of which do not actually contain any translated strings)
+  - updated by community and partially by RH localization effort
+
+- selinux source repository (https://github.com/fedora-selinux/selinux)
+  - is kept up-to-date with fedora.zanata
+
+How to update source files on fedora.zanata:
+  $ git clone git@github.com:fedora-selinux/selinux.git
+  $ cd selinux/policycoreutils/po
+    # generate new potfile
+  $ make policycoreutils.pot
+    # Push potfiles to zanata
+  $ zanata-cli push --push-type source
+
+How to pull new translations from zanata
+  $ git clone git@github.com:fedora-selinux/selinux.git
+  $ cd policycoreutils/po
+    # Make sure "zanata.xml" file pointing to corresponding translations branch is present
+    # Optionally update source files on zanata
+    # Pull new translations from zanata
+  $ zanata-cli -e pull --pull-type trans