Add Readme and license

Author: Florent VIOLLEAU

LICENSE-MIT

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+MIT License
+
+Copyright (c) 2016 
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# dynhost
+Script to update periodically your OVH DNS via DynHost and use the Livebox to retrieve the public IP
+
+## OVH user creation.
+To use that script, you have to set a login and a password. This login and password have to be created by going in the OVH manager. Chose your domain name section, and move to the dyndns tab
+
+
+## Cron
+Use with cron to launch periodicaly
+
+```
+crontab -e
+  00 * * * * /usr/local/dynhost/dynhost
+```
+
+## Config file
+
+You can use the sample config file given (dynhost.sample.cfg). Rename it to dynhost.cfg and change the variables to meet your own parameters. Use cron this way.
+
+```
+crontab -e
+  00 * * * * /usr/local/dynhost/dynhost /usr/local/dynhost/dynhost.cfg
+```