corrected minor typos, added license

README.md

@@ -14,8 +14,8 @@ License, see [below](#license)
 
 sync-router
 -----------
-Shell scripts used to synchronize the current Cisco startup configuration, IOS
-images and DHCP static lease files with with a GIT repository. This scripts
+Shell script used to synchronize the current Cisco startup configuration, IOS
+images and DHCP static lease files with with a GIT repository. This script
 assumes one (git-managed) subdirectory per router. It performs the following
 operations when invoked:
 
@@ -29,3 +29,19 @@ operations when invoked:
 
 I use this script to keep the configuration of my cisco router(s) in a GIT
 repository on my server to keep track of changes and always have a backup of it.
+
+
+<a name="license">License</a>
+=============================
+This script, documentation and configuration examples are free software: you can
+redistribute and/or modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation, either version 3 of the License,
+or (at your option) any later version.
+
+This script, documentation and configuration examples are 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program.  If not, download it from <http://www.gnu.org/licenses/>.