doc: added README

README.md

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+# ic3s
+
+> Import your liked Talks from the 38c3 Hub in your Calendar
+
+## Usage (Android)
+
+Requirements:
+
+- ICSx5
+- Fossify Calendar (other Calendar Apps could also work)
+
+In ICSx5 subscribe to a new calendar on `+`. For the Webcal-Address type in the
+url on which ic3s is hosted: 
+
+```
+https://{HOST}/events.ics
+```
+
+Enable authentication and enter your credentials from the 38c3 Hub. At last
+click on `subscribe`. It now should tell you that it successfully downloaded
+your calendar. 
+
+Now go to Fossify Calendar, click on the three dots on the top right and
+settings. Go down to the *CalDAV* heading, click an `manage synchronised
+calendars` and select the url you just entered in ICSx5 and apply. You might
+need to pull down on the main screen of Fossify and ICSx5 until the loading
+symbol appears to get the latest data. 
+
+## Setup
+
+Start `ic3s` as a service. Here an example for freebsd:
+
+```sh
+#!/bin/sh
+
+# PROVIDE: ic3s
+# REQUIRE: LOGIN
+# KEYWORD: shutdown
+
+. /etc/rc.subr
+
+name=ic3s
+rcvar=ic3s_enable
+
+load_rc_config $name
+
+: ${ic3s_enable="NO"}
+: ${ic3s_user="ic3s"}
+
+
+command=/usr/sbin/daemon
+procname=/usr/local/bin/ic3s
+pidfile=/var/run/${name}/${name}.pid
+
+command_args="-c -p ${pidfile} ${procname}"
+
+run_rc_command "$1"
+```
+
+Put this in your `nginx.conf`
+```
+server {
+    ...
+    location /events.ics {
+	    proxy_pass http://127.0.0.1:8080$request_uri;
+	    proxy_set_header Host $http_host;
+	    proxy_buffering off;
+    }
+    ...
+}
+```
+
+Have fun :)
+
+## License
+
+This project is licensed under the AGPL-3 License - see the `LICENSE` file for details