docs: add README.md

README.md

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+## Quick Start
+
+Start a syncplay service, default at port tcp/8999.
+
+```bash
+docker run -d \
+--net=host \
+--name=syncplay \
+-e PORT=<PORT> \
+-e PASSWORD=<PASSWORD> \
+dnomd343/syncplay
+```
+
+If TLS is enabled, you have to set hostname and certificate folder
+
+```bash
+docker run -d \
+--net=host \
+--name=syncplay \
+--hostname=syncplay.your.domain
+-e PORT=<PORT> \
+-e PASSWORD=<PASSWORD> \
+-e TLS=/certs \
+-v <certs>:/certs \
+dnomd343/syncplay
+```