add license info, prepare for pushing to crates.io

sasl/README.md

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+sasl-rs
+=======
+
+What's this?
+------------
+
+A crate which handles SASL authentication.
+
+What license is it under?
+-------------------------
+
+LGPLv3 or later. See `COPYING` and `COPYING.LESSER`.
+
+License yadda yadda.
+--------------------
+
+  Copyright 2017, sasl-rs contributors.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.