adds readme file

README.md

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+## dmr-dashboard
+
+by Dominic Reich OE7DRT
+
+### About
+
+This is a very simple dashboard for **YSF only**. It loops through the logfile of
+MMDVMHost and displays the information that you already know from Pi-Star.
+
+This dashboard is for people that don't know how to code one for theirself. As I'm
+not a good programmer there might be still a lot of bugs, but the board works for me
+and I do not have high standards to meet - I just want a simple dashboard that I can
+also look at from my phone. Otherwise I would rather look into the logs on the command
+line.
+
+### Installation
+
+Copy all files into your webroot and modify `config.php` to your needs.
+
+### Licenses
+
+Some code (Stylesheet) was taken from Pi-Star by Andy Taylor.
+
+The rest (php) is published using the MIT License.
+